I can get a chart to calculate open issues by week, using created and resolved totals by week. But I would like to get a similar chart but instead of a count of open issues by week, I also want that broken out by one of the custom fields. For example, if the custom field is 'project priority' then each bar should have a breakdown of all open issues that week with project priority broken out in the stacked bar. Is there a straightforward way to do this using atlassian analytics (no apps)?