It has been rolled out in the beta version for Android and iOS users ... feature on the already existing WhatsApp channel. Users will see the option of a QR code near the channel information ...

WhatsApp has rolled out new features for its app on Android and iOS including features like tappable reactions, online indicator in groups, and more.

Open your favorite browser and go to web.whatsapp.com. Here, you'll see a QR code on the right side of the screen. Now, you'll have to scan the QR code using your iPhone or Android smartphone.