It would be nice to differentiate HoT healing from incoming cast heals in the healing prediction. Maybe add an option to change the color of HoTs on unit frames.

Any update for this functionality?

I see that it's supported by a few other addons based upon the previous version of healcomm, for example:
https://www.curseforge.com/wow/addons/classichealprediction

and

https://www.curseforge.com/wow/addons/healcommclassic

I totally love Luna and would love to see this additional functionality supported.