I'm trying to isolate individual keywords for use in other fields such as Caption and Persons Shown.  
For example, take a photo of Peyton Manning playing in a game.  Keywords: Peyton Manning, Quarterback, Colts.  
I'd like to use variables to fill out the Caption field in a similar format to: {keyword1} plays {keyword2} for {keyword3} at {Location} in {city}, on {todaymonthname} {todayday}, {iptcyear4}.  
Ideally output would be: Peyton Manning plays Quaterterback for Colts at Lucas Oil Field in Indianapolis, on October 10, 2016.  But as far as I can tell, the only variable for keywords is {keywords} which applies ALL keywords, "Peyton Manning, Quarterback, Colts".
Another application would be using {keyword1} to propagate into the Persons Shown field.  
Is there a way to do this?  Perhaps a workaround I'm not thinking of?
Thanks!