How to allow reading of all fields except one?

Question

firebase

There is a profile in which you need to make all fields available for reading except email. The email field is only available to the profile owner.

airport
 created
 email
 name
 ratings
 ratingsList
 type
 uid

I do so. The email field remains available to everyone. How can I make it read-only?

"$profileId": {
        ".indexOn": ".value",
        ".read": true,
        "email": {
          ".read": "auth.uid == $profileId"
        }
      }