Batch edit activitiy type?

Hi!

Have imported lots of old Strava and Runkeeper runs into Garmin Connect but they are all listed as "Other". Manually changing all of them is proving tedious and wondering if there is a proven way of batch editing them?

Have found two old threads pointing to using some javascript in Firefox's console or a Python script however neither of these seem to work with the current version of Garmin Connect?

Any leads out there??