back in the days I had my Linux-PC run as a bluetooth-sink, that'd work for directly connecting some chromecast to the pc
but if you'd have some audio-out on your TV (or whatever station between your chromecast and tv) then you could connect your line-in on your PC to that (and have a much preferable cable connection)
Der Schwanz, der im ganzen letzten Jahr mit dem Hund wedelte, fragt sich jetzt öffentlich ob er den Hund wirklich braucht?