You don't need to know what to ask for. Say it the way you'd say it to a friend. A voice note, half a spreadsheet or a screenshot is enough, and we reply with a first move: what could exist, a scope, a price and a date.
Someone senior reads what you sent and asks the two or three questions that matter.
It takes thirty minutes: who the users are, what data we can touch and what good looks like. Sometimes we skip it.
It covers what could exist, a scope, a price and a date, or it's an honest "not yet" with what we'd do instead.