You can cast content from the mobile app to a TV by following these directions:

iOS

Option 1: Use the “Airplay” icon which will cast to a TV with AppleTV or any Airplay enabled smart TV
 

Option 2: Download “Google Home” and Cast the full screen (for users only with Chromecast) - https://www.businessinsider.com/how-to-chromecast-from-iphone?r=AU&IR=T

Android

Many Android devices have in-built streaming capabilities to Chromecast. For example: Samsung phones have a program called “Smart View”

https://www.samsung.com/uk/support/tv-audio-video/what-is-screen-mirroring-and-how-do-i-use-it-with-my-samsung-tv-and-samsung-mobile-device/