The guide "Configuring and managing Windows virtual machines" in https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/10/html-single/configuring_and_managing_windows_virtual_machines/index explains how to "Preparing an IBM Z system to host virtual machines" and "Preparing an ARM 64 system to host virtual machines" .
I also was not able to find the documention which lists which guest OS are supported on RHEL 10 at all.