I am not sure how to cast to the Chromecast as I don’t have one. But for viewing on a TV I recommend a standalone box like a Roku or Fire TV or Apple TV connected to your HDTV.
See link below. “Chromecast is not a streaming set-top-box. It is a screen mirroring device that connects to your TV.
Chromecast allows you to begin video playback on Android mobile devices or PCs with the Chrome extension and ‘cast’ that content to your big screen TV.”
The Chrome browser on your Windows 10 computer needs to have the proper extension to cast to your Chromecast.