Self Service Report - Adding dynamic title

I would like for the title of these reports we made to be dynamic. This SSR starts with a Requirement Document as the root item.

I'd like for the title to be dynamic. Below is just me hoping somehow handlebars or mustache would magically work.

$root.item_number? Do I need to adjust the form that is the title form of the report and add some sort function to add a dynamic title?

I'm hoping this is already a built-in behavior that I just don't know how to use!

Side want: Export to Excel names a .XLS with some id. It is not the ID of the root item of the report though. Might be nice to give that a format too so it is like, "item_number + datetime()" or something.