Limit items in relation Link lookup

Is there any way to limit the scope of items in the dropdown list when adding a relation link? We’re trying to link synced GitHub pull requests with stories, bugs, etc, but once synced there are a few thousand PR entities, however the vast majority are closed.

There’s no way to do it currently, sorry.

Related:

Also this

Perhaps the workflow field could be used to implement scope-limitation? Like a toggle for “do not show entities in final state”?