How to generate shader source from material as text?

Hello,
For educational purposes i want to create material and then generate shader source as text and read this text. How can I do that? I tried to read shader files from repository but it is difficult.

I started with something like that but I failed. This snipper returns null ;/

var context = new MaterialGeneratorContext(material, GraphicsDevice);
 context.Step = MaterialGeneratorStep.GenerateShader;
 context.PushLayer(null);
 context.PopLayer();
 var source = context.ComputeShaderSource(MaterialShaderStage.Vertex);

Start by reproducing the provided MaterialGeneratorContext snippet and inspect MaterialGeneratorStep.GenerateShader, PushLayer, PopLayer, and ComputeShaderSource(MaterialShaderStage.Vertex). Read the shader files in the repository to understand the expected generation flow. Done means documenting a working way to obtain the generated shader text, or clearly explaining why the snippet returns null.