atom don't have native support. u can try with fakecpuid
follow here
https://www.olarila.com/topic/5794-hackintosh-guide-install-macos-with-vanilla-olarila-image-step-by-step-install-and-post-install-windows-linux-or-mac/
use my folder for z490 vision d and update things for big sur
https://easyupload.io/f4l0ws
u just need a full dsdt patched after that
big sur is a shot in the dar for now