Integrating Gantt Chart alike feature with Roadmap

[ambujp]

Let me know if title of this request is hard to understand. 

I really like the way Epics can be used to create Roadmap in Next Gen JIRA.

One extension of this which would make things beautiful (at least in my image of things) is if length of "Bar" in roadmap can change depending on "Start date" and "End date"  of the "Tasks"  linked to that epic. 

Meaning : Start point of that epic should be earliest start date linked to epic and End point of the epic should be latest end date in the linked ticket in epic. 

What do we get by this : Dynamic Roadmap, which can help visualize latest high level status of project.