So, as the title says, my suggestion is the criminals to get a notification as if there's an ongoing JB. I thought of the idea, because lately, I've been spawning as SAP, so I noticed that half of the times I enter the jail to do a JB, someone is already doing it, so I pretty much lose my time getting in there.
The notification shouldn't be the same for both sides, maybe the crims can get a notification like "A few criminals have escaped from the Jail! Freedom!", or whatever, the main idea is to just get a notification once a criminal crosses the red door.