How to set firebase config from env variable in service worker with next js?

To receive the push notification in the background , need to init firebase sdk in the background using service worker as per [this doc](https://firebase.google.com/docs/cloud-messaging/js/receive#setting_notification_options_in_the_service_worker)

here when the Firebase config is added statically everything is working fine .

In service worker, process.env.ENV_NAME is not available, how to init SDK in server worker which allows to inject firebase config dynamically in Next Js via environment variable?