To answer your question, no i dont think there's a easy way. But I dont see why you would need to. If you doing a mesh, then bake the normal's and AO though e.g Xnormal. If your doing a texture. Non PBR you can paint it in the diffuse, PBR you can just make your own. not that hard for a flat texture.
Thank you for your answer. The thing is that you cant get an ndo2 result with xnormal or any other baking tool. I think the "AO" that ndo2 generates is not actually AO.(it has a little colour in it and shadows are different) But whatever it is, it's really cool specially using it as an overlay on top of the diffuse map(for…