Latest Fedora delivers 0.11 version. Upstream released 0.12. When you have free time, please upgrade it.
Built for rawhide last week. https://koji.fedoraproject.org/koji/buildinfo?buildID=1312907
You build it only for Fedora 30. If you want to add it to the release, please create an update for the build. I merge and built perl-MojoX-JSON-RPC-0.12 for Rawhide. https://koji.fedoraproject.org/koji/buildinfo?buildID=1318711