kf6-kimageformats from home:alveus:kde:plasma project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:alveus:kde:plasma/openSUSE_Tumbleweed/home:alveus:kde:plasma.repo zypper refresh zypper install kf6-kimageformats