Hello,
We're using Jira 6 and Jira Agile. We are tring to make the use of Gantt chart plugin, to accomplish something like in the demo:

The difference is we want the first level is Version, i.e.
Version 1
- Sprint 1
- Sprint 2
Because the gantt chart is for future planning, we don't want to specify all future tasks with a exact start and end time. We only want to specify the start/end time to the versions and sprints.
How can we do that? In Jira Agile, the start/end time of a sprint is only given when the sprint is started.
And about the start/end time of the versions, we tried to go to "Agile->Classic", add the parent relationship of the version and the start/end time of the versions.
What else do we need to do to get something like in the demo?
Many thanks!