Line chart for projected backlog completion with optimistic and pessimistic

I as a Product Owner or Scrum Master want to see a report generated by Greenhopper/JIRA Agile which shows the projected completion for the current backlog items so that I can better understand what the overall project status is today.

Further thoughts:

• able to select which epics to include as "total backlog"
• calculation based on story points
• configurable average velocity (how many or which past sprints to consider for average)
• utilize average velocity to calculate projected completion
• show how many sprints until completed
• show optimistic and pessimistic line
• configurable optimistic and pessimistic calculation (percentage)

I'm doing this today in Excel based on data I'm extracting out of JIRA.
This is the most important chart for our project and helps everybody involved to better understand where we at and take actions early to influence the project for the better.

Attaching an image of the chart I'm creating in Excel at the moment.