Is your feature request related to a problem? Please describe.
Question/Feature Request

Describe the solution you'd like
Wanted to check on couple of things:

1. Is there a way to show a custom label in the empty hole of a Donut chart. Like showing the total count, something like below
   
2. How do i reduce the width of the ring in the donut chart?

Checklist

• this request is checked against already exist requests
• every related Kibana issue is listed under Kibana Cross Issues list
• kibana cross issue tag is associated to the issue if any kibana cross issue is present