If this is a response to me then you are not understanding what the feature would do.
The feature would give users the ability to identify portions of any data as possibly containing hallucinations. I also am not asking any entity to take on the responsibility of identifying such but to give the users when creating such a way to identify with meta data that it may contain hallucinations. Thus the mention of Hide Details, the user chooses to use that when needed and it only applies to as much or as little as the user chooses, it can even be used multiple times in the same reply.