class ReactNativeInternalCallback(
    private val reactContext: ReactContext
) : SessionReplayInternalCallback {
   private var resourceQueue: SessionReplayInternalResourceQueue? = null
  (....)
  
      override fun addResourceItem(identifier: String, resourceData: ByteArray, mimeType: String?) {
        resourceQueue?.addResourceItem(identifier, resourceData, mimeType)
    }
    
    override fun setResourceQueue(resourceQueue: SessionReplayInternalResourceQueue) {
        this.resourceQueue = resourceQueue
    }
}

------
val internalCallback = ReactNativeInternalCallback(reactContext)
val configuration = SessionReplayConfiguration.Builder(replaySampleRate.toFloat())
  (....)
  .addExtensionSupport(ReactNativeSessionReplayExtensionSupport(textViewUtils, internalCallback))
  .let {
      _SessionReplayInternalProxy(it).setInternalCallback(internalCallback)
  }
  
sessionReplayProvider().enable(configuration.build(), sdkCore)
------
 
 // custom mapper
 internalCallback.addResourceItem(
    id,
    content,
    mimeType // "image/svg+xml"
)