Run riverpod provider in background flutter

Question

I have a provider which is watching the position changes:

@riverpod
Stream<Position> positionStream(
PositionStreamRef ref,
) async* {
final locationService = ref.watch(locationServiceProvider);

yield* locationService.geolocator.getPositionStream(
locationSettings: locationService.getLocationSettings(),
 );
}

I then watch the positionStreamProvider provider in another provider.

@riverpod
Stream<List<MyObject>> myObjectsWithinRadius(MyObjectsWithinRadiusRef ref) {
  final myLocation =
      ref.watch(positionStreamProvider.select((value) => value.valueOrNull));
  return ref
      .watch(myObjectsWithinRadiusRepoProvider(
          myLocation!.latitude, myLocation.longitude))
      .getObjects();
}

A key feature of the app is to work in background as well as in foreground, and send notification as soon as an object is found within a certain radius. I have read about isolate but that seems kind of over complicated. I have also look at the flutter_background_geolocation package, but it costs more than 300 bucks for the single app license. Is there a simpler, latest way to get the providers run in the background?