Get the maximum concurrency of a CI runner via the API

I’d like to get the concurrent config of a CI runner via the API (probably this endpoint: Runners API | GitLab). I haven’t found any possibility to get this information. Am I missing something?

I’m aiming for a way to determine the utilization of a runner: I can see if a runner is busy with several jobs via the API, but there’s no chance to find out whether the runner is at its configured limit for concurrent jobs.

I’m not sure, is this a feature request that should be “made official” in the issue tracker? Or is there already such a thing and I missed in when searching for it?