yeah i tried this because i wasn't sure but it still didn't work so i assume theres something in my implementation that is wrong. Spoke to my domain hosters and they said its all supported
if ur domain doesnt support ajax cors or u have other issues, u could try to get it over github
https://patrickulrich.com/2022/12/26/how-to-setup-nip-05-verification-using-github-pages/
Discussion
U are able to test cors onnur own
https://github.com/cactuz/cors-tester-from-browser
Did the hoster Support an custom A record also