Timeline: View count of task per day

We plan our tasks as subitems and we us the field «timeline» to schedule the tasks. As an overview, we use the timeline to see the planned tasks per day. Would it be possible to see at the top or bottom of the timeline how many tasks are planned for a certain day? Or would it be possible to have a widget, that shows a graph with the sum of planned tasks per day? In other words, is there a formula, that shows the count of subitems on a specific day?