Customer Import - Email Purpose

Hi,

We're using the interface tables to import customers into 12.1.3 instance.  Importing Email contact information is fine using ra_contact_phones_int_all, but how do we get the Contact Email purpose uploaded (see below).  i.e. which field in the ra_contact_phones_int_all should be populated to get this piece of information done.  Or is there some other way to bulk upload this.

Thanks in advance.