Can we get a 'damage overkill' statistic?

To play Devil's advocate, many stats can help you improve your gaming efficiency. Like if you're not dealing a lot of damage with an aoe champion, or you're not taking a lot of damage as a frontliner, etc, things to help you improve.

But on the flipside, an overkill mechanic would help too. A high one for certain champions that execute would indicate you're executing brilliantly, and with non-executing champions (particularly duelists?) a high number could indicate you're, well, overdoing it and could serve to be more efficient.

tl;dr: yeah you're right.