Voxelized Lighting and Meshes

I’d like to set up a system that allows me to import .vox (voxel data) files into UE4 and have each voxel rendered as a cube but I have no idea where to start. Would probably need to be a plugin?

With this system I would like the cubes (voxels) to render at a certain brightness depending on how much light it is receiving.
IE: Instead of shadows being cast onto the cube mesh, the entire voxel becomes shaded / lit at once.
I’m looking for an effect that would resemble very low rez, non-smoothed lighting on objects.

I’m also curious of how difficult it would be to optimize this system to do something like a very low budget path-trace.

Thanks for any help!