Hello! I'm trying to use material instancing with a shader created with ShaderGraph. I don't seem to find the way to set any property to be used in a MaterialPropertyBlock. I tried compiling the shader's code, adding the [PerRenderData] attribute before the property declaration but t doesn't work. Also, it looks like it can't be saved at all since when I open the code again, my [PerRenderData] attribute gets deleted. How should I approach this?