How to make specific texture glow?

I making models for my game via Blockbench (because of course), and I came up with this character, which skin is should glow, gold part should be metalic and purple coat should be purple coat. Gladly, GD5 have the “Keep model material” setting for 3D models.
So, here the question: how to make only one texture of a model self-illuminate, not the whole thing using blockbench tools.
I’am using A3F for the lightninh, by the way

No lightning effect at all

All lightning effect on

What I bassially want (Photoshoped)

I’am proud of myself! =3