In the manual import process and especially in the import from file process it is possible to create contacts with additional data that can be used as variables in the text of the messages.

All the information of a contact can be viewed and edited in the section Contacts of the account.

By default there is a name field (with the variable %NAME%) for all the contacts and also other columns can be added with any contact information (with the variables %FIELD1%, %FIELD2%, %FIELDX%).