I intent to create UE5 tool that will wright lightmap texture into vertex colors of static mesh instance. Something similiar was possible in UDK (as google says), I mean bake light into vertex colors (lit with vertex colors) . I need this functionality to add decorative lightspots to basecolor via vertex colors, without tons of additional lightsources in scene and without manual vertex painting in UE.
I see all baked lightmaps in lightmass block of World Settings, they look like parts of huge atlass. But I have no idea how to get access to them.