Alter PreGenerateResponseEvent response

If you put something like this inside the PreGenerateResponseEvent event subscriber it should work:

// Logic to know it is suppose to trigger.
    $event->setForcedOutputObject(new ChatOutput(
      new ChatMessage('user', 'You have been banned!'),
      [],
      [],
    ));

Note that the raw output you can't really replicate, so this will first and forthmost work for any site with either a known provider or any solution that uses normalization (which should be just about any).

Added this + some lines about what is possible in the PreGenerateResponseEvent in the actual documentation.