We have a large project (~400 issues) with an estimated end date and we work in sprints. I would like to be able to show a burndown chart for the total project to track our progress. I know a burndown by project is not available in Jira. I thought about creating a second sprint, but issues would cross both sprints, so that won't work. Does anyone have a workaround or app that could accomplish this? I've looked at a simple chart in Excel, but that's mostly manual.