Can we use Firebase as a common backend for an iOS app and Wordpress website both?

We are creating an employer/employee platform where employer would like to use a Wordpress website while the employees will use an iOS app.

Because of our newness to iOS development, we only are proficient in using Firebase as the backend for iOS apps.

Is it possible to use the same (Firebase) backend for the iOS app, and our Wordpress website as well ?

If not, what other technology stack can we use for backend that will serve both our iOS app and the Wordpress website ?

thank you in advance:)