All you need do is apply a different, though unique, Style name to each of the content controls, then use three STYLEREF fields in the document footer referencing those three styles in turn.
For more information on the STYLEREF field, see: https://support.microsoft.com/en-us/office/field-codes-styleref-field-4ad557c2-c8ab-48ba-8fe3-901d0a5775d0