nikon z8 nef

You can convert the Z8 .NEF raw images to .DNG using the free Adobe DNG Converter. The .DNG images are viewable in Finder, Quick Look or Preview. Adobe DNG Converter 15.3 or later converts raw Z8 .NEF images to .DNG.

…and, as I may have mentioned before, you can preview them without conversion in XnView.

https://www.xnview.com/en/xnviewmp/

Z8 RAW files are not supported by Preview, Quick Look or the Finder in Ventura

Digital camera RAW formats supported by iOS 16, iPadOS 16, and macOS Ventura - Apple Support

Yep. Here is proof from XnViewMP v1.4.5 on Ventura 13.4.1:

Works in Monterey as well.