SwiftUI Map Marker w/ AsyncImage

Using Swift
1

Pretty simple, I want to use an AsyncImage inside a Marker.

Something like this:

Map(position: $examplePosition) {
    Marker(coordinate: exampleCoord) {
        AsyncImage(url: exampleUrl)
    }
}

However... this either crashes the app or I just see a blank black square where the image should be. Why can't I do this?