So .. actually I've been porting libguestfs & guestfs-tools to Mac M1 a couple of weeks ago. I'm intending to write up docs on how to build it, and didn't get around to it, but it will eventually appear here: https://listman.redhat.com/archives/libguestfs/
Last time I tried setting up libvirt/libguestfs on my work Mac M1 I ran into various problems and gave up. This was somewhere around April 2022.