Subtitles font

The styling of closed captions and subtitles on Apple TV respects the stylings made in Settings.app — except the font used. It’s always what I assume is the Channels default (Courier, maybe? something monospace) no matter what. Is this by design? Is it possible to change the font/type face of the captions?

I think the subtitles font is a standard broadcast font which can’t be changed.