I like to see on stada live stream from the Chromecast ultra to YouTube I play on my tv
Hello @Frostyh1978,
That is not available right now.
You always share your suggestions by using the Feedback option within the Stadia app or stadia.google.com.
This can be done if you have access to a laptop/desktop - start the game on your Chromecast then using your laptop/desktop start the YT stream.