HRV data

I have been taking interest in HRV recently and find the stress score widget pretty pointless, so I enabled the logging of HRV data on the watch. I can see the actual data being recorded to the fit file using fit2tcx.runalyze.com but can anyone tell me if there's data displayed in Garmin or Firstbeat that I can analyse? Or would it be some other 3rd party app?

Thanks