Best way:
Use OnlineMapsTileSetControl.GetWorldPosition to convert the coordinates of the corners of your image to Unity World Position. Make a mesh based on this point.
With OnlineMaps.OnChangePosition and OnlineMaps.OnChangeZoom, update the positions of the mesh vertices.

I have a mesh ground object with a high resolution aerial texture of a specified area. I know the area boundaries in GPS coordinates.
I'd like to add this mesh to the tileset scene, for example, so when zooming in on this GPS location my object will be shown in the correct position and scale, seemingly a built-in part of the map.

Is there an existing example for this application? If not, how do you suggest to approach this?

Thanks