Sorry, but why would including the prompt in the pull request make any difference? Explain what you DID in the pull request. If you can't summarize it yourself, it means you didn't review it yourself, so why should I have to do it for you?
The point of adding the "prompt", or the discussion with the LLM is learning. You can go back and see what was the exact conversation.
It's like having someone watch a livestream screen recording of you writing the code.
It's nice to have there IF you need to go back and learn something, but hardly a review requirement.