CGI in dark environments


I'm new with filming with a green screen and had an idea for a short where I have a character in a dark room and want to have a creature appear in the shadows. What would be the best way to go about setting up the shot? It would be a wide where the actor would be in the foreground and the creature would be in the background. I plan on using Blender and After Effects in post. Would I light the green screen separate and darken the foreground, or would keeping the actor in set position and masking out the dark background work better. I've looked up tutorials, but I can't seem to find one about cgi and a dark environment. Also would anyone know if there is a way to add shadow onto a shot in post in after effects or blender.

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