Power/HR in Z2 metric

Is there any chance we could have a stream showing the power trend (in watts) at a specific HR value, such as at a given % of LTHR or % of max HR?

At the moment, the existing stream has a great logic (1’ splits and HR lag plus cadence filter), but it divides average power by average HR across the entire Z2 range. In my opinion and experience, this metric would become even more useful and robust if it captured a narrower effort range. Even better if more filters could be applied, excluding activities with very high VI, IF, and temperature.

I would love to try developing an external tool to produce this, but perhaps this could even be feasible internally. Any thoughts on the feasibility of something like this, either externally or within Intervals itself?