For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:2.12rc1/standard/home:michael-chang:grub:2.12rc1.repo
zypper refresh
zypper install grub2
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:2.12rc1/openSUSE_Tumbleweed/home:michael-chang:grub:2.12rc1.repo
zypper refresh
zypper install grub2
For openSUSE Factory RISCV run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:2.12rc1/openSUSE_Factory_RISCV/home:michael-chang:grub:2.12rc1.repo
zypper refresh
zypper install grub2
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:2.12rc1/openSUSE_Factory_ARM/home:michael-chang:grub:2.12rc1.repo
zypper refresh
zypper install grub2
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:2.12rc1/openSUSE_Factory/home:michael-chang:grub:2.12rc1.repo
zypper refresh
zypper install grub2
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:2.12rc1/15.5/home:michael-chang:grub:2.12rc1.repo
zypper refresh
zypper install grub2
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:2.12rc1/15.4/home:michael-chang:grub:2.12rc1.repo
zypper refresh
zypper install grub2