Adjusting the Height Channel Preview in Painters Viewport

Hello,

I don't have experience in writing Shaders and I'm just looking into it. I have problems properly displaying the height and displacement values in the viewport. Its a lot of times just black and enabling the "Use +/- color for HDR values helps a bit, but not enough.

I understand, that I would need to write a custom shader to change that. I'm currently using the pbr-metal-rough-with-alpha-blending shader. Is there any opportunity to edit these values and how would I do this?

Would be great, if someone could help.

Thanks in advance