Somehow I had not heard of HRV until your post. I was hoping my Apple Watch could track it, but it seems that as of this date, Apple only reports average variability (SDNN: the standard deviation between beats). They don't even let third party developers access the underlying raw data.
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When I learned about HRV about a year ago I was similarly surprised that I had never heard of it. Perhaps it is newer knowledge of maybe it just never caught on.
I'm not totally sure, but SDNN has shown up in some older HRV apps I've used, so it might be enough information to go on.