Google has added the Apple TV app -- which provides access to Apple TV Plus -- to the Chromecast with Google TV device.
TV+ app on Google TV with chromecast - un… - Apple Community
The Apple TV app is on its way to Chromecast with Google TV
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Chromecast with Google TV - Google Store
Chromecast with Google TV (HD) - Streaming Device
Apple TV now available on Chromecast with Google TV - 9to5Google
Stream Apple TV to Chromecast and Enjoy Endless Entertainment
iPhone users can now download Google TV from the Appstore