Display Milestone in Google Timeline sheet

[Shyam Agrawal]

Hi,
We have a requirement to display Milestone marker along with timeline bar. I tried with overlay using Scatter chart but no success.

We have below data points:
Task ID
Task Name
Task Start date
Task end date
Milestone name
Milestone Start Date
Milestone end Date
Percent processing
Task status

As per Timeline requirement, I used below fields:
Task Name
Task Status
Task Start Date
Task end Date

Please let me know if anyone find any clue.

Thanks,
Shyam