Show the amount of damage shielded after matches!

I often play as Kayle or Lux support, and after every match, I find myself wondering... How much damage did I prevent via applying shields to my allies? I can see how much damage I've healed, dealt etc... but why not how much health I preserved? PLEASE show this info in the grid view! I would very much like to compare how spot on I am compared to others when it comes to shielding.