For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:yfjiang:gnome41update/openSUSE_Leap_15.4/home:yfjiang:gnome41update.repo
zypper refresh
zypper install gsf-office-thumbnailer
For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:yfjiang:gnome41update/openSUSE_Leap_15.3/home:yfjiang:gnome41update.repo
zypper refresh
zypper install gsf-office-thumbnailer
For SLE 15 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:yfjiang:gnome41update/SLE_15_SP4/home:yfjiang:gnome41update.repo
zypper refresh
zypper install gsf-office-thumbnailer