Zoom is not currently supported to access via Chromecast or view via Apple TV onto your TV screen.
Alternatively, you can connect your computer laptop to your TV by plugging in a HDMI cord into the output on your computer and to the input on your TV. Choose the correct input on your TV through your menu with your remote control. Once this is connected. Click on the zoom link for the session. You may be prompted to download app via your website browser if this is the first time accessing zoom. Read more about downloading Zoom here