I’ve been thinking more about this. The goal is to identify which cables are used exclusively in a rack vs which ones will run outside a rack. Since all gear once placed in a rack is identified with rack information, could you not leverage that info and compare it to the gear it is connected to? If the gear it connects to also shows that it is in the same rack then that is one text color for the end of the arrow as well as the socket text in the device. If the connecting gear is not in that rack then another text color?