Using fly-log-shipper to ship prometheus metrics

I’m using GitHub - superfly/fly-log-shipper: Ship logs from fly to other providers to send logs to my vendor, since log shipper uses vector under the hood I would love to add an other input to scrape the fly managed prometheus instance, would would be the endpoint I need to query from within my vpn (if I can)? or no matter what I need to go through internet (https://api.fly.io/prometheus/ <org-slug>/ )?