grease pencil material issue

Hello, I have had this idea for some time now. Can we separate the material from the surface and turn it into a sub option or attributes for painting or filling tools? In this way, the material is just a simple material, just a simple color. we can also change the style of painting or filling at any time without creating many new materials and searching for style among numerous materials.I think separating it is good, we should not mix it with the material. When choosing materials, we should only consider the material itself, rather than also considering the style of painting and filling