For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:bsc:1198684/standard/home:michael-chang:bsc:1198684.repo
zypper refresh
zypper install grub2
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:bsc:1198684/openSUSE_Tumbleweed/home:michael-chang:bsc:1198684.repo
zypper refresh
zypper install grub2
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:bsc:1198684/openSUSE_Factory/home:michael-chang:bsc:1198684.repo
zypper refresh
zypper install grub2