You can create a Unity custom asset, that "glows". It is a single option to enable in the very standard unity material tab. Though, it is easy to miss. This would act somewhat similar to an emissive panel. You could even add an image to it (in Unity).
As you may know, this only works to a certain extend and not like a real VaM light source. If you want to go a bit further, than you maybe could bake a Unity light source into it (but still not e real VaM light).