I do realize it's not the same at all, but Pixelmator for Mac is a great little image editor that has "Remove background" and more AI-powered features, such as smart up-scaling.
The Lock Screen on iOS , safari, photos, keynote, shortcuts etc…
I don’t think there’s API access though which would be really handy.
I don't remember the steps, but its either in a menu or you can press and hold the foreground object to make a "cut out" of it and paste it in a different app. https://youtu.be/qX82kIaRNKA?t=15