Not in the traditional way, I think that's not possible to archive such nice looking in the AC editor, however I'll try to mix the roughness/metalness/specular maps into the "_map" texture to see what happens
Can't wait for that ! It probably will not look as crazy as in your SketchFab, but I think it should be something.
Would be great example of skin_map possibilities. I like that Alfa GTA bare metal skin, good example also. But this would be next level.