Hi Lucas, the functionality you are asking for would be more then welcome if you ask me. We are working in teams of 6 people and working on multiple projects in sprints of two weeks. To have the ability to create an overview of the items that have been set to done (with a burndown chart for example) would really give meaningful insights.
Did you try the batteries in the dashboard section? They come close to what you are looking for but not entirely.
There has been some discussion on this topic here Burndown charts - #11 by aaron23
Cheers