For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:wbem/openSUSE_Tumbleweed/systemsmanagement:wbem.repo
zypper refresh
zypper install openwsman-yast
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:wbem/15.5/systemsmanagement:wbem.repo
zypper refresh
zypper install openwsman-yast
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:wbem/15.4/systemsmanagement:wbem.repo
zypper refresh
zypper install openwsman-yast