How to override metric name?

hi , I encounter the same problem . I use grafana + prometheus monitor metrics from etcd .

in template I define a variable like this:

$cluster label_values(etcd_server_has_leader,job)

and I select in prometheus the result shows:


also the variables shows “ch-etcd-global” and “th-etcd-global”,
I want to make “ch-etcd-global” showed as “china” and “th-etcd-global” showed as "thailand "
, at the same time I do not want the other variable which dependent on it invalid.
what should I do ?
thanks in advance !