Ability to mark a trip as cancelled

I have some trips in my profile that I haven't actually taken (but still count in the stats/leaderboard) so there should be a way to mark them as cancelled (so they still show up at least in a different section of Trips menu but they don't count towards stats/coverage/leaderboard progress) Deleting them is an option but that would break the journey links I made (so it isn't ideal)