Hey nodebb community,

I'm just new to nodebb but already did some research about the available hooks. I want to add a custom field to user profiles and found this: https://docs.nodebb.org/nb_NO/latest/plugins/hooks.html#filter-user-custom-fields

The documentation says
Allows you to append custom fields to the newly created user, ex. mobileNumber

what about existing user accounts?
can someone provide sample code on how to add a custom profile field that can be set by new and already existing user accounts?

thanks!