Update Activity RPE via API?

[bfef]

Hi everyone!  I am somewhat familiar with Strava's API both directly via HTTP and with the Python Stravalib library through my visualization app Heatflask (https://www.heatflask.com) (Client ID 12700) which I has been running since 2016.

However I have another thing I am trying to do on my own.  I have a lot of old activities that I imported from SportTracks dating from 2009 - 2014, very few of which have heart-rate data.  I would like to retroactively update RPE (https://support.strava.com/hc/en-us/articles/360032535512-Perceived-Exertion) for these activities by comparing with similar more recent efforts.   I can manually change that value one activity at a time on Strava website, which is really slow.  Is there any way I can do it via API? I do not see RPE as a parameter for Activity update (https://developers.strava.com/docs/reference/#api-models-UpdatableActivity).

In fact, the only info I have seen about RPE for Strava's API was this groups message from 2019, and it is still not part of the official documentation:  

https://groups.google.com/g/strava-api/c/7R8fgacDrXc/m/xLPd8CJzBgAJ

Is anyone out there modifying RPE using Strava's API?  How are you doing it? Thanks!!

Efrem

(This message is cross-posted on Strava Developer Community Google group.)

[bfef]

Wow.  Nothing.  Am I missing something here?