Add properties to the Resource Statistics Report (Parameters)

Hello everyone!

I need to generate some reports based on predefined properties I created to classified the documents.

For example, I want to know how many documents were classified to the property Brazil, or to the property Germany...

There are some properties already defined on the Resource Statistics Report (Parameter), like create by, modified by... I wanted to know if there is any way to add my properties to the list.

thanks,

Luisa