Detonation by health damage (Secondary damage)

Is your feature request related to a problem? Please describe.
I'm doing a build that is centering on explosion on death damage, but PoB doesn't give an estimated hit for that. I'm aiming for 150% of life as chaos damage and I have no idea what that will end up being per hit.

Describe the solution you'd like
I would like an option to see the secondary damage in the calculations screen using average monster health for the level, or even minimum would be ok. It would need to include all of the modifiers that affect the secondary damage.

Describe alternatives you've considered
Secondary damage hit bonuses as a general concept. They are affected by things like AoE, Area Damage, Flat Damage, general damage types (Chaos, Physical, etc.). Even if I could only see the modifiers to damage, I could work out the final damage from that.

Additional context
Add any other context or screenshots about the feature request here.

The issue names no files or tests. Start by locating the calculations screen and the existing secondary-damage handling, then trace how damage modifiers and average monster health are represented. Done would mean the requested secondary hit damage or its applicable modifiers appear in calculations for detonation-by-health effects.