How can I add +/- 20% variance lines to the forecasted trendline on my burndown chart?

[Eric Longoria]

I am using Greenhopper to create burndown charts for my team.  The burndown chart depicts our forecasted trendline well.  I would like to add a "+20% variance" and a "-20% variance" line above and below, respectively, my forecasted trendline.  These lines are intended to depict our acceptable level of variance in the burndown. 

Is it possible to add such a line?

[Timothy · Accepted solution]

Unless you write your own add on module using the data from JIRA Agile, that is not an option at the moment.

[Eric Longoria]

I figured that that was the case. I'm pretty familiar with Jira and these burndown charts and I haven't seen anything like what I'm requesting in the question above. Wanted to check with the community to make sure. Thanks for the input!