It's very nice, but no, Keyboard Maestro has nothing like that.
I would simply create one image for each button, centred around the desired button, and click at the center of the image.
I can't remember ever wanting to click at specific offsets in an image, generally, the image is of a UI control and I just want to click the UI control, anywhere will do.
Otherwise, as I showed, you can use the offset as a percentage, so that would work pretty easily most of the time (in the example shown, multiples of 10% would be enough to uniquely identify the buttons).
But I agree, it's a nice UI.