Rhino 8 Feature: Native GPU procedural texture support

What is the process if we want to modify or create a new procedural texture and add it to rhino? I found Shaderconverter.cs which describe the Procedural class and I found some idea to improve the Wood procedural adding some grain parametrically, and would like to test some Z noise to create modulation in the height of the wood, Is thee-re a simple way to create a new class and test it?

Thanks for your help