I am trying to calculate a field's value by using FF's built in "calculations" section. This works well as long as the visibility is set to "Everyone". However - in my case - this field is not supposed to be shown to the "normal" user. And because it calculates sensitive data, hiding it using CSS is not an option.
So, how can I calculate a field with visibility set to "Administrator", when a (normal) user completes the form?