This is not how the OS is designed. The biometric data never leaves your phone. In fact, it’s kept in a security coprocessor that doesn’t have access to the network.

This is not easy to bypass. Typically, that fingerprint sensor is connected directly to that security processor and not to the main. This is a design decision to prevent stealing your fingerprint. Even on a completely compromised Android system, your fingerprint data is not accessible because android never had access to your fingerprints in the first place.