This idea has been merged into another idea. To comment or vote on this idea, please visit A-I-12072 Custom grouping options on Gantt chart.
While in Custom Roadmaps the ability to select different Aha! Fields on the chart helps to focus the used on the data they need. It would be great that on the Feature Gantt chart we had a similar functionality, currently only fixed can be shown or removed. In our case we would love to be able to show the JIRA Key.