Or only Heart Rate when when uploading the track data with e.g. Garmin Connect:
With CombineGPX, you can augment the COBI.Bike GPX export with the Heart Rate data GPX export(s) and Temperature FIT export logged with e.g. myWorkouts:
It also outputs some pretty SVG:
Requires Java 9 or newer.
Usage: Double click .jar or java -jar CombineGPX.jar [cobi.gpx hr.gpx [hr2.gpx …] [tempe.fit]]
Tip: When §@#! COBI.Bike once again didn't upload track data, choose Connect export twice and replace ns3 with gpxtpx.