How to use OverlayImageLayer with an image with unknown coordinates

[IonelRST]

I want to use flutter_map to show an image without a defined size and put markers on it (using coordinates).

I tried it using OverlayImageLayer and getting the bounds from the MapController but bounds from the controller seem to be the size of the parent. I this case I can scroll and zoom the image but I cannot do it if I do it outside of the image (still inside of FlutterMap widget).

This is the code that I'm using:

                      FlutterMap(
                        mapController: mapController,
                        options: MapOptions(
                          onMapReady: () {
                            _latLngBounds = mapController.bounds!;
                            setState(() {});
                          },
                          crs: CrsSimple(),
                          zoom: 1,
                        ),
                        children: [
                          _latLngBounds != null
                              ? OverlayImageLayer(overlayImages: [
                                  OverlayImage(
                                      bounds: _latLngBounds!,
                                      opacity: 1,
                                      imageProvider:
                                          FileImage(currentLayoutFile!)),
                                ])
                              : const SizedBox(),
                        ],
                      ),

Is there any way to obtain the bounds of an image?
Does someone know if it is doable?