How to share a dashboard to grafana server to other grafana servers

Hey guys,
I have 3 grafana server: A, B and C.
On grafana B, I have 1 dashboard.
On grafana C, I have 1 dashboard.

From grafana A, I can’t connect to database on grafana B, C (security reason).
But I want to share dashboard from grafana B, C to grafana A.

Please help me to share it.
Thanks :smile: