Polybrush texture blend Shader (HDRP) no normal map?

Hi there!

I am new to Polybrush and probably I just have not found it yet, but in the tutorial there is a "Texture Blend Bump" preset with slots for albedo AND normal maps. But that is in standard rendering pipeline and does not work in HDRP.

The only shader that seems to be for HDRP is a "Texture Blend" preset with only Albedo-Slots.

Are normal maps packed in some of the RGBA channels? I have not found any information on that anywhere.

I hope somebody can help me!