diff --git a/Classes/Command/ImportCommandController.php b/Classes/Command/ImportCommandController.php
index 32fda3f..504ee66 100644
--- a/Classes/Command/ImportCommandController.php
+++ b/Classes/Command/ImportCommandController.php
@@ -37,15 +37,21 @@ public function importCommand(string $preset, ?bool $quiet = null, ?bool $forceU
      * @param bool|null $quiet If set, no output, apart from errors, will be displayed
      * @param bool|null $forceUpdates If set, all local records will be updated regardless of their version/timestamp. This is useful for node type changes that require new data to be fetched
      * @param bool|null $fromFixture If set, the data will be loaded from a local fixture file instead of the configured data source
+     * @param string|null $overrideSourceOptions Allows to override default options for the data source via JSON, e.g. '{"endpoint":"https://some-custom.tld/endpoint"}'
+     * @param string|null $overrideTargetOptions Allows to override default options for the data target via JSON, e.g. '{"endpoint":"https://some-custom.tld/endpoint"}'
      */
-    public function runCommand(string $preset, ?bool $quiet = null, ?bool $forceUpdates = null, ?bool $fromFixture = null): void
+    public function runCommand(string $preset, ?bool $quiet = null, ?bool $forceUpdates = null, ?bool $fromFixture = null, ?string $overrideSourceOptions = null, ?string $overrideTargetOptions = null): void
     {
-        if ($fromFixture === true) {
-            $importService = $this->importServiceFactory->createWithFixture($preset);
+        $customSourceOptions = self::parseJsonOption($overrideSourceOptions);
+        $customTargetOptions = self::parseJsonOption($overrideTargetOptions);
+        if ($fromFixture) {
+            if ($customSourceOptions !== null) {
+                throw new \InvalidArgumentException('The options from-fixture and override-source-options must not be combined!', 1716824420);
+            }
+            $importService = $this->importServiceFactory->createWithFixture($preset, $customTargetOptions);
         } else {
-            $importService = $this->importServiceFactory->create($preset);
+            $importService = $this->importServiceFactory->create($preset, $customSourceOptions, $customTargetOptions);
         }
-
         $this->registerEventHandlers($importService, $quiet ?? false);
         try {
             $importService->importData($forceUpdates ?? false);
@@ -110,6 +116,8 @@ public function presetsCommand(): void
 
     /**
      * Displays configuration for a given preset
+     *
+     * @param string $preset The preset to show configuration for (see Wwwision.Import.presets setting)
      */
     public function presetCommand(string $preset): void
     {
@@ -164,6 +172,18 @@ private function renderResult(Result $result): void
         array_map(fn (Message $message) => $this->outputLine('<success>%s</success>', [$message->render()]), $result->getNotices());
     }
 
+    private static function parseJsonOption(string|null $option): ?array
+    {
+        if ($option === null) {
+            return null;
+        }
+        try {
+            return json_decode($option, true, 512, JSON_THROW_ON_ERROR);
+        } catch (\JsonException $e) {
+            throw new \InvalidArgumentException(sprintf('Failed to JSON-decode option "%s": %s', $option, $e->getMessage()), 1716823861);
+        }
+    }
+
     /**
      * @param ImportService $importService
      * @param bool $quiet
diff --git a/Classes/Factory/ImportServiceFactory.php b/Classes/Factory/ImportServiceFactory.php
index a14c143..7033457 100644
--- a/Classes/Factory/ImportServiceFactory.php
+++ b/Classes/Factory/ImportServiceFactory.php
@@ -23,9 +23,9 @@ public function __construct(
     ) {
     }
 
-    public function create(string $presetName): ImportService
+    public function create(string $presetName, array|null $customSourceOptions, array|null $customTargetOptions): ImportService
     {
-        return new ImportService($this->presetFactory->create($this->getPresetConfiguration($presetName)));
+        return new ImportService($this->presetFactory->create($this->getPresetConfiguration($presetName), $customSourceOptions, $customTargetOptions));
     }
 
     public function createFromPreset(Preset $preset): ImportService
@@ -33,9 +33,9 @@ public function createFromPreset(Preset $preset): ImportService
         return new ImportService($preset);
     }
 
-    public function createWithFixture(string $presetName): ImportService
+    public function createWithFixture(string $presetName, array|null $customTargetOptions): ImportService
     {
-        $preset = $this->presetFactory->create($this->getPresetConfiguration($presetName));
+        $preset = $this->presetFactory->create($this->getPresetConfiguration($presetName), null, $customTargetOptions);
         if (!isset($this->presets[$presetName]['source']['fixture']['file'])) {
             throw new \RuntimeException(sprintf('Missing "source.fixture.file" configuration for preset "%s"', $presetName), 1558433554);
         }
@@ -49,7 +49,7 @@ public function createWithFixture(string $presetName): ImportService
 
     public function createWithDataSource(string $presetName, DataSourceInterface $dataSource): ImportService
     {
-        return new ImportService($this->presetFactory->create($this->getPresetConfiguration($presetName))->withDataSource($dataSource));
+        return new ImportService($this->presetFactory->create($this->getPresetConfiguration($presetName), null, null)->withDataSource($dataSource));
     }
 
     public function getPresetConfiguration(string $presetName): array
diff --git a/Classes/Factory/PresetFactory.php b/Classes/Factory/PresetFactory.php
index cd2f1c2..fba37c9 100644
--- a/Classes/Factory/PresetFactory.php
+++ b/Classes/Factory/PresetFactory.php
@@ -24,7 +24,7 @@ protected function __construct(
     {
     }
 
-    public function create(array $configuration): Preset
+    public function create(array $configuration, array|null $customSourceOptions, array|null $customTargetOptions): Preset
     {
         if (!isset($configuration['source']['factory'])) {
             throw new \RuntimeException('Missing "source.factory" configuration', 1557238721);
@@ -39,15 +39,18 @@ public function create(array $configuration): Preset
             throw new \RuntimeException(sprintf('The configured "source.factory" %s is not an instance of %s', $factoryClassName, DataSourceFactoryInterface::class), 1557238800);
         }
         $options = $configuration['source']['options'] ?? [];
+        if ($customSourceOptions !== null) {
+            $options = [...$options, ...$customSourceOptions];
+        }
         try {
             $dataSourceFactory->optionsSchema()->validate($options);
         } catch (\InvalidArgumentException $e) {
             throw new \RuntimeException(sprintf('Failed to create data source for factory of type %s: %s', $factoryClassName, $e->getMessage()), 1716822862, $e);
         }
-        return $this->createWithDataSource($configuration, $dataSourceFactory->create($options));
+        return $this->createWithDataSource($configuration, $dataSourceFactory->create($options), $customTargetOptions);
     }
 
-    public function createWithDataSource(array $configuration, DataSourceInterface $dataSource): Preset
+    public function createWithDataSource(array $configuration, DataSourceInterface $dataSource, array|null $customTargetOptions): Preset
     {
         if (!isset($configuration['mapping'])) {
             throw new \RuntimeException('Missing "mapping" configuration', 1558080904);
@@ -71,6 +74,9 @@ public function createWithDataSource(array $configuration, DataSourceInterface $
             throw new \RuntimeException(sprintf('The configured "target.factory" %s is not an instance of %s', $factoryClassName, DataTargetFactoryInterface::class), 1557238877);
         }
         $options = $configuration['target']['options'] ?? [];
+        if ($customTargetOptions !== null) {
+            $options = [...$options, ...$customTargetOptions];
+        }
         try {
             $dataTargetFactory->optionsSchema()->validate($options);
         } catch (\InvalidArgumentException $e) {
diff --git a/README.md b/README.md
index df00eff..2b91a1b 100644
--- a/README.md
+++ b/README.md
@@ -126,9 +126,11 @@ Synchronizes data (add, update,delete) for the given preset.
 #### Options
 
 ```
-  --quiet              If set, no output, apart from errors, will be displayed
-  --force-updates      If set, all local records will be updated regardless of their version/timestamp. This is useful for node type changes that require new data to be fetched
-  --from-fixture       If set, the data will be loaded from a local fixture file instead of the configured data source
+  --quiet                   If set, no output, apart from errors, will be displayed
+  --force-updates           If set, all local records will be updated regardless of their version/timestamp. This is useful for node type changes that require new data to be fetched
+  --from-fixture            If set, the data will be loaded from a local fixture file instead of the configured data source
+  --override-source-options Allows to override default options for the data source via JSON, e.g. '{"endpoint":"https://some-custom.tld/endpoint"}'
+  --override-target-options Allows to override default options for the data target via JSON, e.g. '{"endpoint":"https://some-custom.tld/endpoint"}'
 ```
 
 ### `import:prune`