Hello Marcelo11756,
Here's my answer. The Listbuilder takes fields from the Contacts table and inserts values into the fields that match in the Listbuilder table. You can add fields to the Contacts table, then add a field of the same name to the Listbuilder table. Then when you insert, the matching field will populate in the listbuilder. If you wants to take already existing Entity fields, you could link them in the Contacts table and then update the Listbuilder table accordingly.
-Inder