grub2-i386-efi from home:tdz:branches:Base:System project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:tdz:branches:Base:System/openSUSE_Tumbleweed/home:tdz:branches:Base:System.repo zypper refresh zypper install grub2-i386-efi