@Jip ok, here is quick and dirty way to do this, but it should be also normalised somehow to something, needs testing. But I just drop it here so people might pick up from it. The whole thing could be automized, I think. https://imgur.com/esZHcAA

Need to look how they work atm, but i think i can try and build converter in substance designer, so anyone can use via substance player, which is free. And with that i can expose controls whatever would be needed, e.g. how shiny it should be etc.