Rank in ai overviews - how?

There's no separate submission or markup for it. Google pulls AI Overview sources from pages it has already indexed, and in practice those tend to be pages that rank reasonably well for the query anyway. So it's normal SEO with a bit more focus on clarity: answer the question plainly near the top, use headings that match how people actually ask it, keep facts accurate and up to date. Also make sure you haven't got nosnippet or similar tags blocking Google from quoting the page.