Perfectly reasonable
(It’s not cheating - the interview isn’t a test, it’s a discussion to see how suitable you would be for a job)
For the main part of the interview you will be scored against the ‘Behaviours’ and ‘Success profiles’ with the specific ones required listed in the job advert and links to the guidance should be included in the advert.
It’s common for a question to be “We’ll now ask you about the behaviour ‘working together’, please give me an example on when you have worked together in a team”
Most of the time therefore you can look at which behaviors are in the advertisement and this is what you will be questioned on.
But each interviewer could ask their questions in a different style, and have additional questions.
So do ask for the questions in advance if you wish (it also to a degree shows that you are prepared to be as engaged as possible with the process)
When in the interview there will probably be follow up questions to what you have just told them, so do be ready to have an unexpected question. But you can still ask for it to be repeated, to clarify the question …. and also you can ask if your answer has given them what they wanted
(Particularly with you answering that you had found your previous job on the website - that’s a valid answer to the question. It could have been a sarcastic/comedy answer but it’s also a factual answer to a question where the words asked don’t provide the context of what the interviewer really wanted to know)