>>105724917
You are not meant to do that.
You can just add the subject and the place (background) in the same image (thus same context) and ask it to do whatever.
In this example, I first asked Kontext to remove the background from AOC's image, manually added her to the backroom (you can use Photoshop/Photopea or whatever, it doesn't take long, or ask Kontext itself if you place both images side by side)