At the moment this is a exclusive novelty of the beta version and it is that Telegram continues to improve its functions over time. This messaging application is constantly changing and direct competition is sometimes nourished by the new features that are implemented in it.
In this case, what users who have this beta version installed are testing is the option to "Announce messages with Siri" an option already available in the Messages app and other official Apple applications that seems to be coming to Telegram soon.
What is «Announce messages with Siri» for
Well, basically what we can do is respond to these messages instantly with how much we have the AirPods or compatible Beats headphones and the active function on our iPhone. In this way, when a Telegram message arrives, Siri will read it out loud and then listen to our response at the moment we tell Siri that we want to respond. Then we dictate the message to be able to answer without touching the iPhone itself. This option must be active from Settings> Notifications> Announce messages with Siri.
This option is currently in beta version and if you have this version installed you can try it although the official date that will reach all users of this great messaging application is unknown. Logically we are not facing a perfect application, Telegram has its flaws but we still like it more than other similar apps. At the moment in this option of «Announce messages with Siri» Telegram would be one of the first third-party apps to implement it, so hopefully they do it soon and well.