How to link WhatsApp app to a device by phone number?

I recently broke my phone and my back camera isn’t working, so I can’t scan QR code. I downloaded the new version of WhatsApp app on my Mac, and I can’t login because the only login option is to scan QR code. Any idea how to login on the app (not WhatsApp Web) by phone number? It works just fine on Web, but the app is more convenient..