How to use ground overlay google map android for polygon area to fit the map image in it?

I have a park area that is not rectangle or a simple shape. It is just like polygon area. I could load sample image on it for testing, in my android app.
There it is :

mGroundOverlayRotated = googleMap.addGroundOverlay(
    GroundOverlayOptions()
        .image(mImages[0])
        .position(LatLng_NEAR_NEWARK, 255f, 84f)
        .bearing(110f)

It is worked for simple shape like rectangle.

1. LatLng_NEAR_NEWARK is latitude/longitude of center of park.
2. 255f is width of area in meter.
3. 84f is height of area.

I cannot using width/height for the area like this.
I can’t figure out how to use Position function in my code to fit it.

I need something like this :

https://stackoverflow.com/questions/26250481/show-only-ground-overlays-map-android

I saw something about KML format. I’m not sure about it. Should I use SVG/PNG format for this area instead of JPG?

What approach do I use?