@JsonKey and $[]List do together do not seem to work

[kauaicreative]

{
   "@JsonKey(name: 'firebase_auth') firebaseAuth": "$[]firebaseAuth" 
}

creates:

@JsonKey(name: 'firebase_auth') firebaseAuth $[]firebaseAuth;

expected:

@JsonKey(name: 'firebase_auth') List<FirebaseAuth> firebaseAuth;