Hi there and welcome
There is only one way to do this, but it still requires and xbox 360 so it kind of defeats the purpose but is the only method. By using the the HDMI input port on the Xbox One. This is really meant to feed your cable or satellite connection to the console, allowing you to watch live TV easily. However, you can manipulate the process by feeding a connection not from your cable, but rather from another console.
By simply connecting one end of an HDMI cord to the Xbox 360 and the other end to the Xbox One’s HDMI input port, you can play 360 games from the Xbox One.
So, when you say “Xbox, Watch TV,” it will take you into the Xbox 360 game rather than a TV feed. This actually works for any HDMI-compliant device (PS4, Wii U).