Need Custom Script Field - Project Lead - But need it to be "Statable" use in Pie Chart Widget

[Robb F Watkins]

Ok when I use a Script Runner Custom field (I initially used a free script cust. field type) to get the project lead for issues - I use the following script:   

issue.getProjectObject().getProjectLead().getDisplayName()

1. I do get the project lead for each issue.  It works in JQL searches, and I can add it as a column but it sorts on first name - would prefer last name sort.  My JQL is:   resolution is EMPTY AND updatedDate <= startOfYear() ORDER BY issueProjectLead, project ASC

2.  I created it as a free text field.  Apparently that is not countable / Statable.  Who knew?!  Ok, maybe you guys but not me.  I can change the context but what kind of field would you use to make a custom field like this one Statable?   I need this to use in the pie graph widget.  I want to display the number of tickets in this state and sort by Project Owner in a nice display.  I can do this by reporter and assignee but not Proj Lead.    

Can I do this?