I have noticed that the media_player card displays the value returned from property app_name. For media players of type TV the media player card should display the media_channel property when the media_content_type property is set to channel (as there won’t be an app_name value in such case).
Checking the media_player card source file I don’t see this type of media handled by the code. I am not an expert in the front end code so I wanted to raise this point here in the hopes that someone can contribute to this and add it.