Starting today, were rolling out a change that enables native support for the W3C WebAuthn implementation for Google Accounts on Apple devices running iOS 13.3 and above. This capability, available for both personal and work Google Accounts, simplifies your security key experience on compatible iOS devices. It allows you to use more types of security keys for your Google Account and the Advanced Protection Program with NFC functionality built-in. You can use a Lightning security key like the YubiKey 5Ci or any USB security key if you have an Apple Lightning to USB Camera Adapter.”]
Source: https://security.googleblog.com/2020/06/making-advanced-protection-program-and.html