I've used the Atlassian out of the box 'issues created vs resolved' template to develop a burn-up chart, but I've like to add an 'ideal line', the line you see on the charts that show that if, for example, you want to complete 30 points in 10 days, you should be completing 3 points a day, and the associated line starts at zero and adds three every day until it reaches 30. Has anyone done on of these?