so I should just set up a level and CRF min&max?
And shall I set the VBV? I don't quite understand the function of VBV
Really don't bother with those other settings. Set a CRF level, and leave the other settings at default. 13 or 14 seems good for HDR to me.
I've sometimes seen VBV and other settings used in combination with Blu-ray specs, but there's another option that automatically applies anything necessary for UHD Blu-ray encodes, so just use that instead.