Utterance prompt for gemini

Hello! Has anybody tried using Gemini model? I set it up as a custom LLM, ant it was pretty straightforward and easy (It’s a post request to https://generativelanguage.googleapis.com/v1beta/models/gemini-pro:generateContent?key={{GEMINI_API_KEY}}
But I’m struggling to create a prompt for utterance suggestions. Has anyone done this already and would be willing to share any tips/prompts made for it?
Thank you in advance.