Timer on Dragon When You Have Vision?

Was thinking about the new dragon. So if you have vision of it, you can see the dragon flying down and then landing on the ledge later coming down. What if when a team has vision of dragon and it is in that animation, we have show the dragon icon with a count down 5, 4, 3, 2, 1 and turn into the regular drag icon. It just is something that identifies that you have the ability to see dragon about to spawn.