Oh, and just to be clear I'm referring to exported gpx files from a logged activity in the app

Ah, that would need “log your activity” as a feature request first, which is rather more of an undertaking. 😀 But I do have some ideas around that for the future…

Ahh, gotcha.  I thought it was already doing that since it tracks your distance, and assumed that the export was what you'd ridden, not what you planned