Figure 1 shows an example of adding "mail address" item to the juser model.
On the detail screen,The mail address part is a link.
Here is an example of preparing the "mail address" item directly under the "Account" item.Check the position you want to insert and choose New from the gear icon.(FIGS. 3 and 4)
An input field is prepared.(Figure 5) We will uncheck it manually here.
We prepared a "mail address" item.The item ID is "mailaddress".Enable search and list respectively.
The "mail address" item is a character string type, but you have attached the mail address attribute.