Is it possible to access Face ID sensors raw data?
FaceId is based on infrared light sensors and depth sensing technology.
All the captured data is saved in the form of Encrypted hashes in the secure enclave.
First of all, the system doesn't allow you to read these files. But in any case
you are able to read the encrypted files, you can not decrypt them for your purpose.

All the encrypted data is saved locally.

If you are creating a new app, you can use these sensors for capturing data.