I have a SharePoint Online site that has a task list with the Timeline enabled. However, the start/due dates are only used for past or present tasks. For future tasks, I have a "Planned Start Date" and "Planned Due Date" field instead. (This was to satisfy another client requirement.)
However, I need my timeline to use the planned dates rather than the built-in start and end dates. How can I customize my timeline to use those fields instead of the default ones?