I tried to modify the class.export.php file, but I'm not a php guru, I couldn't do it.
return self::dumpQuery($tickets,
array(
'number' => __('Ticket Number'),
'created' => __('Date Created'),
'cdata.subject' => __('Subject'),
'user.name' => __('From'),
'user.default_email.address' => __('From Email'),
'cdata.:priority.priority_desc' => __('Priority'),
'dept::getLocalName' => __('Department'),
'topic::getName' => __('Help Topic'),
'source' => __('Source'),
'status::getName' =>__('Current Status'),
'lastupdate' => __('Last Updated'),
'est_duedate' => __('Due Date'),
'isoverdue' => __('Overdue'),
'isanswered' => __('Answered'),
'staff::getName' => __('Agent Assigned'),
'team::getName' => __('Team Assigned'),
'thread_count' => __('Thread Count'),
'attachment_count' => __('Attachment Count'),
'user::getOrganization' => __('Org'),
) + $cdata,