Semantic release - maintenance release with suffix

Question

I would like to achieve this using semantic release.

master: 1.1.0 (release1) ---- 1.1.1 (release2)--------
          \
           \
release1:   \ ---- feat(Something): ---- 1.1.0-mr.0 --- feat(SomethingElse): --- 1.1.0-mr.1

So release/1 could be at 1.1.0, release/2 could be at 1.1.1.

I want to be able to do a maintenance release from branch release/1, hopefully following the 1.1.0-mr.1 convention.

I tried using the prerelease mechanism but that increases the version regardless. I just want the suffix to be appended.