Since MS haven't bothered making a new gamercard that supports XboxOne (still only shows 360), I've changed the field to point to the TrueAchievements card which shows both. If you want this field to work, please get an account there accordingly and setup your card.

I'm still trying to figure out how to rename the label on the profile field.....
Edit: solved

I'm still trying to figure out how to rename the label on the profile field.....
Edit: solved