The Azure DevOps documentation that describes Burndown and Burnup Charts describes the following types of burndown charts (quotations are from the link above):
However, I would like to implement a feature burndown where the X-axis is a sprint or date (same as either of the 2 charts above) and the y-axis is either the count of the number of stories + bugs or the sum of the points. Most importantly, this feature burndown chart would show only the children of a specific feature item, such as this list of 4:
How can I please generate this feature burndown chart described above?
Sorry, it's not available right now. What you are looking for is a filter such as below:
We already had a raised feature request in our Develop Community user voice site:
Epic / Feature Burndown Chart
https://developercommunity.visualstudio.com/idea/964703/epic-feature-burndown-chart.html
You could kindly vote up it and monitor the status, our PM will review them.