I have jobs that should only be executed on slaves matching a specific label expression, BUT with the possibility to select a specific slave within this label expression (so a Label parameter instead of a Node parameter is not an option here).

I could be settings the "Possible nodes" in the Node parameter to only those matching my label expression, but my pool of slaves changes quite frequently. When a slave is added or removed from the pool, it would take a long time to edit all my jobs to add/remove this slave.

A solution would be to add a "Allowed label expression" field to the Node parameter, that would show only the slaves matching this label expression when launching the job.