If you don't want to install the Google Home app on your iPhone, you can cast the Chrome browser's contents to Chromecast using the Chrome browser itself. Here's how:
1. Connect both the Chromecast device and iPhone to the same Wifi Network.
2. Open the Chrome browser on your iPhone.
3. Tap on the 'three-dot' icon in the bottom-right corner of the screen.
4. Tap on "Cast" from the list of options.
5. Select your Chromecast device from the available devices.
6. Now, open the website or file that you want to cast on your TV screen.