Hi,
You can find several burndown chart examples in our public demo account.
https://eazybi.com/accounts/1000/dashboards/16201-forecast-and-management
https://eazybi.com/accounts/1000/dashboards/27385-time-tracking
You may also wish to check the presentation on different ways of how to create burndown charts in eazyBI: Presentation slides and videos from eazyBI Remote Community Day - Apr 3, 2020
Kindly,
Janis, eazyBI support