Unfortunately, unless you are a top-paying customer or very important studio, there is no such thing as Feature Requests in Unreal Engine… You could try to create a [Feature Request] post on the forum, but there is very few chance someone at Epic would handle it.
Apart from that, I can see why this is something not implemented actually: such feature is in reality quite complex to implement, because you need to sample light and compute shadow volume/map using all the mesh geometry, that would be quite computationally intensive for real-time application. I don’t think there is other engines that implement this in real-time.
Actually, the feature is implemented for emissive materials… in the Path Tracer render mode (which is not realtime), as well as probably with static Lightmaps. But definitively, in realtime with Lumen, this is not yet possible.