Replace chroma key with image?

[andrewtampa]

I may just not know the right way to search for this. I've tried chroma key replacement, masking, and find color (among other things).

If I have a template image (created in Canva, for example), that I want to place a placeholder rectangle where I can later insert an image in code, is this possible in ImageSharp? This goes beyond color replacement, but is similar(?).

So, create a 1080x1080 image. Within that image place a green square with Hex #00b140 starting at x=100, y=80, h=200, w=200
( a square floating in a square)

Can I locate the coordinates of that green square inside the image or bitmap, then use those coordinates to use Mutate to DrawImage at that location and size?

Thanks