PWTT parameter

Hello,

Fluke Prosim8 now realIy good device, but I consider that PWTT parameter in Fluke Prosim8 will be great new feature (more info about it, i.e https://eu.nihonkohden.com/en/innovativetechnologies/pwtt/howitworks.html). But if PWTT parameter it's difficult make in new software version may be there is a way make more stable phase difference between PPG and ECG signals (now phase between theese signals changes slowly over time)?