Add shadow to MarkerComposable of Google Maps in Compose

Question

I have a map implemented with Google Maps and I use a MarkerComposable to create a custom marker. So far, so good. But I need to add a small elevation with its shadow, and even though I pass it as a modifier, on the map it appears without the shadow. If I do it on a surface, the shadow is shown, so could it be that the GoogleMap composable doesn't allow adding shadows to markers?

I have seen this pending issue: https://github.com/googlemaps/android-maps-compose/issues/398

Thanks in advance!

// ...
    MarkerComposable(
        keys = arrayOf(isSelected),
        state = MarkerState(location.toLatLng()),
        onClick = { _ ->
            onMarkerClick()
            false
        },
    ) {
        Image(
            painter = painterResource(painter),
            contentDescription = null,
            modifier = Modifier.shadow(elevation = 5.dp) // Doesn't show the shadow
        )
    }
// ...