feature idea: it is possible to calculate Respiratory Rate from HRV and add into FIT

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Now this is a much harder feature idea but I don't think too hard, maybe a weekend of coding and would be a really neat feature to add to HRV test?

Older Garmins but still very popular like the Fenix5/935 series do not calculate respiratory rate on their HRV stress test. Only the slightly newer Garmin models and what's frustrating even their $100 models have it but not the $500 Fenix5

But it is possible to calculate from HRV data. I've done it but I'd never figure out how to add it to your app. Oura tells us exactly how to do it:

https://d1a0efioav7lro.cloudfront.net/wp-content/uploads/2020/05/12195157/How-Oura-calculates-respiratory-rate.jpg

I've posted some code/results on the Garmin forums which may help?

https://forums.garmin.com/developer/fit-sdk/f/discussion/245469/tool-idea-calculate-inject-respiration-rate-into-fit-when-using-hrv-on-older-watches