Filetype for strength training

I’m developing a client side web app for recording strength workouts and want to be able to upload them to intervals.icu

Both Strava and intervals.icu support gpx, tcx and fit files. gpx and tcx seem to be focussed on recording heart rate, power, gps data, not the exercise, weight, reps and sets data which is relevant for strength training.

I’ve looked into the fit file sdk, but the javascript version of the sdk is decode only, not encode.

Any ideas anyone?

EDIT This is similar to the request here Import Strong data (weightlifting app)

If intervals.icu could accept a csv, json or xml with the details of a strength session via the api that would be wonderful.

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