Baking lighting for procedurally generated levels

Hello,

I'm working on a game that has procedurally generated levels. It uses prefab rooms and connects them together to create a level. The rooms are just a ceiling, walls, and floor. The props are randomly added in after the rooms are placed. This situation seems like it needs to use realtime lights, but using them brings the fps down to 5 for mobile.

Does anyone know if it's possible to bake lighting/reflection probes/light probes for the rooms and save that data to each room's prefab? Baking lighting currently seems to be saved to the scene, which doesn't work for me since the scene starts empty.

 

With custom shader you could create a lightmap g buffer that would update only when light change