yast2-pkg-bindings-devel-doc from YaST:SLE-15:SP2 project
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zypper addrepo https://download.opensuse.org/repositories/YaST:SLE-15:SP2/openSUSE_Leap_15.2/YaST:SLE-15:SP2.repo zypper refresh zypper install yast2-pkg-bindings-devel-doc