Для openSUSE Leap 15.2 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:EDV_Lotse:1C/openSUSE_Leap_15.2/home:EDV_Lotse:1C.repo
zypper refresh
zypper install libjavascriptcoregtk-3_0-0
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:EDV_Lotse:1C/15.4/home:EDV_Lotse:1C.repo
zypper refresh
zypper install libjavascriptcoregtk-3_0-0
Для 15.3 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:EDV_Lotse:1C/15.3/home:EDV_Lotse:1C.repo
zypper refresh
zypper install libjavascriptcoregtk-3_0-0