The only documentation I was able to find is this - https://preactjs.com/guide/switching-to-preact
but it seems like it's not relevant to preact-cli since they mentions webpack.config.js which doesn't exist in preact-cli.
It would be great to have a how-to guide as part of the official preact-cli (as part of the website or just a markdown file inside a docs folder in the repo) that guide new users in using react components.