How can I get the "gateway unique ID" for warp+

How can I get the gateway unique ID for warp+ on Android?

That is the unique DoH subdomain associated with the DNS filtering Location/Policy you wish to apply if you are using Cloudflare’s Gateway DNS.

https://developers.cloudflare.com/gateway/getting-started-new/configuring-clients/browser/?_ga=2.108098692.705872689.1602523222-1326366804.1602110919