Overwatch, as an example, allows you to see in game that you're currently holding gold damage/blocking/healing/etc...
It would be a little complicated to implement that in League though, as it's not really by game as much as it is by average stats over several games.
Not to mention: if they were to put that in game, there is a 200% chance all the toxic players would be like "report our adc red damage, useless noob, etc, etc..." so there's a very low chance they're really even seeing that as a QoL thing...just another thing for people to argue over.