Symfony4上的Firebase

I use Firebase on my Symfony application.So, I install kreait/firebase-bundle but I don't know which file I can configure this bundle on symfony4.

This configuration:

kreait_firebase:

    connections:
    main:
    host: 
    secret: 
    references:
      users:  

Which file I can use this configuration??

in the documentation packagist you can configure your settup in :

config/packages/firebase.yaml

thanks :)