For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:playablepliable/openSUSE_Tumbleweed/home:playablepliable.repo
zypper refresh
zypper install jellyfin-media-player
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:playablepliable/15.6/home:playablepliable.repo
zypper refresh
zypper install jellyfin-media-player
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:playablepliable/15.5/home:playablepliable.repo
zypper refresh
zypper install jellyfin-media-player