Scanned user attributes are stored in the tblADusers database table. The attribute mentioned in your post is not currently scanned however. I've added this feature to the wish list, but do not have an estimated release date for it.
This is not something we can provide instructions or support for, but you could perhaps use OPENQUERY to query additional Active Directory information directly from a report. This will require you to install the Lansweeper database under SQL Server. More info on OPENQUERY can be found in
this article on the Microsoft website.