Need a quick fix on Charge code

Hello, all. This should be incredibly easy for someone, but I'm clueless. My player has a Staff of Striking. I want to add a macro to his attack toolbar that lets him expend charges. I have that much figured out: [[?{Number Of Charges?|1,1|2,2|3,3}d6 ]] My question is, how do I have it output in the chat with the type of damage (Force), and how do I center it the way that all damage gets centered when it rolls? Like I said, I'm sure this isn't hard, I just have no idea how to do it.

[[?{Number Of Charges?|1|2|3}d6[Force] ]] This will show the "Force" part if you hover mouse over the result, but if you give more context how the rest of the thing looks/works, we can make something better. What game/sheet are you using?