This is really a grafana question, not a prometheus question.  You can make 
a new variable in exactly the same way as the "instance" one to capture the 
"server" label:

Instance:
Query: 
query_result(pg_settings_seq_page_cost{instance="$instance",job="postgres_exporter"})
Regex: /.*server="([^"]+).*/

If necessary, replace pg_settings_seq_page_cost with some metric that you 
expect to see as part of *every* postgres instance scrape.

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