ok, I don't know if this will help yet, because I'm still learning the structure of Nuke, and untill I get my normal computer working I won't be able to edit the files to look at the codeing, but what you need to do is use a Count query and have that stored in a variable ($something) and drop that variable next to the variable used to display the category names.

One of the site ppls here could most likely explain it better, or even have the code, but this is all I can do to help for now, till I get my stupid computer fixed.....