Setting reverse proxy url instead of default google url

[deeeed]

Hi,

I am trying to avoid the case of users having specific google DNS blocked.
Is there a way to use my reverse proxy to to redirect all requests from my app to a custom firestore url?
I can see that the url for real time database is accessible through:

const prevApp = firebase.apps[0]
      const prevAppOptions = prevApp.options
      // initialize a new app with the new settings
      console.debug(`prev database url:`, prevAppOptions)
      // overwrite the databaseURL
      // prevAppOptions.databaseURL = 'https://custom-domain-proxy.com'
      firebase.initializeApp(prevAppOptions)

But I am not sure how to edit the firestore settings.

I can see there is a host setting https://firebase.google.com/docs/reference/ios/firebasefirestore/api/reference/Classes/FIRFirestoreSettings#host in the native SDK. Would it be possible to set this value with react native config?

Thanks for the help