How to make Class autocomplete and allowaddmore

On the registration page, we want end user to enter class (type instead of dropdown select) so we did “conceptSetUI”: { “Class”: { “autocomplete”: true, “allowAddMore” : true } in registration/app.json Please note Class has been created as Coded Concept with answers. Also a person attribute class has been created.

Is there any possibility to make ‘coded’ concept as ‘autocomplete’ on the registration page so that user can add new entries too?