Yes this can be done. But not by me.
I decided that I would not deal with such a granularity of details to maintain the OCaml opam-repository health on cmdliner releases (which are not the most pleasant thing to do given the amount of reverse dependencies). If your package fails because of the release, it gets a constraint.
I’m also a bit annoyed in this in case since I’m pretty sure I already warned the project on an earlier cmdliner release that they should not run expect tests in the repo on error message they don’t control.
This wastes everyone’s time. I repeat, be mindful about the tests you run in the OCaml opam-repository.