That's a great suggestion! It'd be helpful if Kagi shared such a pattern across all locations where AI-generated content appears.
For example, here's a Quick Peek response that has some very odd punctuation, that makes the sentence difficult to parse. Ignore the punctuation, though, and you get a perfectly fine sentence. Nothing major, mind you, but might be worth investigating, nevertheless.

Source: https://kagi.com/search?q=matter+over+thread+devices
P.S.: I clearly prefer a flag icon over a thumbs-down to keep the "tone" neutral — and the submitter's blood pressure down. 😉 As the OP suggests, though, any "Additional Comments" field should be optional, as that keeps the friction of providing feedback to an absolutely minimum.