Damage Prevented/Mitigated Statistic?

Is it possible to show the numbers for how much damage you prevented/mitigated in the end-of-game statistics? I often wonder how much damage I prevented as Orianna, Lulu, even Kayle (with her ult), and just other champs in general that have a way of preventing/mitigating damage or blocking it from their allies (a la Braum). We get to see damage taken, damage dealt, and even healing done, but there isn't a stat report for damage prevented. Would that be a difficult thing to implement?