Line of sight shading / culling?

Is there a way to get an effect like this in unity? I want to have line of sight lighting where anything not visible from a point is VERY dark. I'm not experienced in shaders or shader graph but I tried using a cel shader to get something similar but black and white is the best I could do, and even then it was buggy. I also tried Occlusion culling but that ends up showing entire objects instead of this nice sharp slice look I've got with this version. I made the first image by chopping the model in blender and stacking in on itself with the under version having a darker albedo, is there some way I could do something similar with a dissolve shader or something??