While I don’t have the exact use case, I have blips appear for squads and also for specific jobs (police see wanted players, EMS see dead players, etc).
I started with Scammers blip/player head indicator script that can be found here: [Release] Scammer's Script Collection (09/03/17)
I made a thread for each case. While true, and then a quick if statement for if blips should be enabled or not, and then iterate each player and add the blip. It was actually pretty straightforward.