In my experience, it requires careful observation, an investigative approach and deep reflection to understand one's needs, context, goals, etc, in order to translate into software requirements.
I'm a big fan and user of GPT for coding and everything, but I don't see it helping a lot with requirements in the foreseeable future. Not with its current capabilities...
ChatGPT would also be useful for the developers to learn more about the domain (assuming no hallucinations) before the kickoff meeting. Let's say you're building some sort of accounting software for the banking sector. You could have a chat session that explains how business processes work in that area, what regulations apply etc. You'd also pick up the correct words/phrases that are used in that domain etc.