These are the exact rules that we currently use to generate Instant View pages for posts on telegram.org. We've added many comments to this template, so it literally speaks for itself.
Voice Calls: Secure, Crystal-Clear, AI-Powered
Telegram Desktop reaches version 1.0 – and it's BEAUTIFUL
Edit Messages, New Mentions and More
Instant View, Telegraph, and Other Goodies
Meet the Telegraph API for Logins and Stats
Unsend Messages, Network Usage, and More