Upgrading custom shader to HDRP

Hello there.
I am working in a HDRP project right now, and I need to adapt a custom shader from the standard pipeline to HDRP.
Sadly, this has proven really difficult, since there's no API nor documentation about.
I have found numerous opinions and turnarounds over forums and tutorials: using a custom node in Shader Graph (which doesn't work if following the official Unity blog), calling a HLSL file from Shader Graph...
One interesting piece explains about how to create a very simple shader for HDRP in HSLS, but if I try to move a complex code, I found that (again, due to the lack of docs) I don't know how Unity handles macros and variables in the new pipeline.

Right now, what I have is a critical shader that is unusable on the new pipeline, and no solution on the horizon. Is there any (updated, if possible) piece of media that can act as a tutorial/documentation on how to handle custom shaders in HDRP?
Thanks.

 

https://docs.unity3d.com/Packages/c...efinition@7.1/manual/Custom-Post-Process.html

 

I write some tutorials for a simple pixel and geometry shader.
It looks similar to the standard surface shader.

video: https://www.youtube.com/watch?v=fiFZMTNM0E4

source code: https://github.com/Paltoquet/HDRPCustomShader