For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:memex.team:archdevops:system/openSUSE_Leap_15.6/home:memex.team:archdevops:system.repo
zypper refresh
zypper install pipewire-media-session
For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:memex.team:archdevops:system/openSUSE_Leap_15.5/home:memex.team:archdevops:system.repo
zypper refresh
zypper install pipewire-media-session