Hi @martinsauter
Thanks for your feedback! Could you clarify, did you try to create the fields with already existed user meta keys in the form builder screen? It’s possible to show already existed user meta on the User Profile forms.
See video https://drive.google.com/file/d/1sEw-OxbwrX5iTbxp3C8sBPFbwDJ93B-J/view
There is an example for “locale” meta_key:


Let me know if that works for you,
Thanks!