I remember playing with a free app a couple of years ago (it's on my old computer) named Materialize. You make your own pbr image files. It was pretty easy, IIRC.

https://boundingboxsoftware.com/materialize/

Materialize is a stand alone tool for creating materials for use in games from images. You can create an entire material from a single image or import the textures you have and generate the textures you need.

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W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."