Follow the steps to cast Google Meet App through Chromecast:

1- Setup: Ensure that your Chromecast-enabled device and your iOS device are connected to the same Wi-Fi network.

2- Start Google Meet Call: Open the Google Meet app on your iOS device and start the video call you want to cast.

3- Screen Mirroring: Use the app screen mirroring feature to mirror your device’s screen to your Chromecast-enabled TV. 

4- Choose Chromecast: Select your Chromecast-enabled device from the list of available devices.

5- Start Mirroring: Your device’s screen, including the Google Meet video call, should now be mirrored on your TV.