There is the third party parser, Advanced Combat Tracker, that reads from the battle log and gives you your numbers (if you're on PC. PS4 is SOL). Does exactly what you're looking for, and goes the extra mile with individual ability damage, how much a boss's attack did, your crit rate, etc

Devs have a pretty hard stance on parsers, so really it's "fight club rules" with them. It's been brought up numerous times that people want an ingame parser to improve with, but they keep saying no (sadly enough)