Data modification and nesting

Hi,

I have been using vis-timeline for a while and want to switch to Apache ECharts. I am following the custom Gantt chart example and have a few questions as follows:
1. Is it possible to have user modify an individual data point (say a task with a specific start time and duration) by using the mouse to move them along the timeline and also to modify its duration?
2. Is it possible to nest the group on the left axis?
3. Is it possible to add overlays to the individual items on the chart, eg, to add circles to indicate status?
4. Is it possible to dynamically change the timezone (allow users to change it say, from GMT to local) via a drop-down context menu?

Cheers,
Vlad

The issue points to the custom Gantt chart example; begin there and inspect how its data and timeline interactions are exposed. Before implementation, narrow the four questions to one supported, testable change and define the example behavior that would count as done.

Written by the indexing model from the issue text.