Currently, I only know how to use the Shader on Nodes, but I want the Shader to target specific PNGs of my Spine sprite. The PNGs in this screenshot are 3 identical spheres in grayscale coloring. I want to define each sphere with Gradient Maps I created.

In actual use case, I want to make a game with customizable color profiles of characters. These include skin color, hair color, eye color, and multiple clothing categories.