grub2-x86_64-efi from home:alphard:RHEL project
Select Your Operating System
Add repository and install manually
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:alphard:RHEL/15.4/home:alphard:RHEL.repo zypper refresh zypper install grub2-x86_64-efi