[Dashboard] Variables Query with if

Hello!

I have metrics:

graphite.servers.host1.mysql...
graphite.servers.host3.mysql...

I want to add Variables with servername to Dashboard only with “graphite.servers.*.mysql”
Now I use query - graphite.servers.{host1,host3}*
But need to add a new server with MySQL manually.

How can I add any servers with metric “graphite.servers.*.mysql”?
In variable want see nameserver.

Thank you in advance!