Can we draw on an Image in the UI

I want to create an image that represents a water tank and show the level in the tank.

Can we get the canvas of the Image or do we need to create a new bitmap that we then draw onto and then set this as the Bitmap of the Image.

I can’t seem to find any sample on how to draw to the canvas or Image.

What is the correct way to draw this type of Image to the UI?