Reporting: Contact Field Values Subject Area Issues

I am trying to build a report using the Contact Field Values subject area and wanted to get some guidance or additional help. Right now the report options in this subject area is very limited, i.e. the fields that show up on the "Entity Field Name" (Attributes) as options are preselected and limited.

First, I would like to see if there is a way to add more fields to this view. It has a limited number of available fields that show up and I don't see a way to add more fields to the "Entity Field Name" as values to report on.