Nexus3 - Maven Gem Artifacts

Hello,
we have migrated our ruby gems (hosted and proxy) from Nexus2 to Nexus3.
But after a while we’ve faced an issue that ‘Maven Gem Artifacts’ feature (Gem Artifacts · sonatype/nexus-ruby-support Wiki · GitHub) doesn’t work on Nexus3.

Is it supported in Nexus3 ? Is there any replacement?

Thanks!