The customize PostProcessEffectSettings can serialize any field without using ParameterOverride?

I want to write my own PostProcessEffectSettings and put some variable like Shader on this settings without using the ParameterOverride, because there field no need to blend between volumn.
I see there has a method FindProperty in PostProcessEffectEditor, used for this normal field. But in my PostProcessEffectRenderer, the field like the shader reference in the settings seems not be serialized.
Is there any thing I miss, or there has any demo to wrtie my own post process?

 

I see this document:
https://github.com/Unity-Technologies/PostProcessing/wiki/Writing-Custom-Effects

But I do not want to use the Shader.Find, it not efficency in Render method, and it not suitable for using asset bundle. My shader is inside the asset bundle.