For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:VaiTon:Ulisse/openSUSE_Tumbleweed/home:VaiTon:Ulisse.repo
zypper refresh
zypper install jsdec
For openSUSE Factory RISCV run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:VaiTon:Ulisse/openSUSE_Factory_RISCV/home:VaiTon:Ulisse.repo
zypper refresh
zypper install jsdec
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:VaiTon:Ulisse/16.0/home:VaiTon:Ulisse.repo
zypper refresh
zypper install jsdec