Voxel Tools - How to make lighting and blackout darkening like in Minecraft?

Probably some of you are familiar with such an interesting plugin as Voxel Tools. I was creating my own minecraft clone I’ve managed to implement everything except lighting. the fact is that I completely removed the sun and removed the shadows and decided to make my own Vertex lighting. I couldn’t implement this using shaders for voxels, but it worked for meshes.

My current goal is to achieve lighting like in Minecraft and darkening in enclosed spaces. without using real shadows and real lighting. does anyone have any ideas or experience on how this can be implemented?