What did you bake your lightmaps as? A .jpg texture? You can still import those. Set the .jpg texture to the ‘emissive’ part of your material. It will not receive shadowing from the light but it should still work (I’ve done it before).
What did you bake your lightmaps as? A .jpg texture? You can still import those. Set the .jpg texture to the ‘emissive’ part of your material. It will not receive shadowing from the light but it should still work (I’ve done it before).