Cumulative Value Flow & Other Kanban metrics

 I'm currently using the built in Cumulative Value flow and the Average Cycle Time chart. I would like to know if there is some workitem (I didn't find the way yet) to add more information to the report. Something like "What this report shows" or some table that allows users to understand the average values taken from the report. From the cumulative flow, having the information of average WIP, average cycle time, average lead time. Also, and probably the most important, add the capability of projection. That is to say, given the current backlog, and current trends, when the release can be completed.