TinyDB connected to FirebaseDb

Hi, everyone

I'm just a beginner and I was following an tutorial about making a login and registration with verification.

link: [METRIC RAT AI2 - Registration & Login with Firebase Authentication]

I added additional blocks to store the data in Firebase so that it appears in real-time. However, the problem is that I also need to connect it to TinyDB. how can I connect them to each other?