I know everyone wants what they want to be integrated into the sim.
But the reality is that some things are simply not available without 3rd Party tools.
Flow by //42 can ‘reveal’ a multitude of ‘hidden’ camera views.
I believe those can vary by aircraft. It looks like all three versions (Free, Essential, Pro) support the camera widget.
EDITED to add: I agree that this would be MUCH more useful if it could be moved to a secondary monitor. Opening Flow, selecting a camera, then closing Flow to get a screenshot is cumbersome at best…