Create a RenderTexture with depth information using HDRP

Hi everyone
I need to create a RenderTexture using a second camera on my scene, where depth is coded into the color (black being close, white being far). I know how to do this the usual way, but I have no idea how to do it on a HDRP scene since you cant use OnRenderImage() for the camera shader.

I tried using a Shader with ShaderGraph using the Depth node, but this would also change how the first camera renders the objects.

1. How can I create a RenderTexture with Depth information on HDRP?
2. How can I use a ShaderGraph shader only on one camera ?