That's a really good idea and I don't think it'll take too much time from developers just to add the command that makes a waypoint to the briefcase, but please add to your suggestion that it works on LS & LV briefcases depending on the city you execute the command at.
That's weird fr, It's not that hard to find a dollar GREEN BLIP at the map and I always find it in maximum 10 seconds not 2-3 minutes? Imagine looking around the map for 3 minutes to see the briefcase! If that really happened with you then you gotta wear some glasses, (No offense I ain't joking) I am Negative and It's unnecessary since Hijack is in purple color and It's hard to see but a green dollar blip is easy to find.
the dollar icon is made for LV, LS briefcase is a brown briefcase 🗿