Flutter Using NetworkImage on an AssetImage Field

Question

With the map library I'm using in flutter app development, I am trying to display a marker image with a cdn url. The problem is that the image type that the Marker class requires is a class called OverlayImage (you can check it out in a link here: https://github.com/note11g/flutter_naver_map/blob/main/lib/src/overlay_image.dart) which takes in an AssetImage class only, but I have to use a NetworkImage in order to use online url.

So, I think the best is to find a way to convert NetworkImage to AssetImage which I am not even sure is possible since they are sibling classes. For now, when I pass a url to OverlayImage, it does not display anything due to the aforementioned problem. If converting to AssetImage doesn't work, then I think I might have to customize the library for my specific usage.

Any suggestions or problem analysis would help!