I’ve been playing around with the best setup for watching F1TV on the big TV and I think I’ve found it with a USB-C to HDMI cable. You can pick this up from various places online, I paid £20 for a 10FT braided cabled one.
What you’ll find is that the when plugged in the image goes onto your TV fine but the audio still plays through the MacBook. You need to head into System Preferences then sound and select as the following image.
You should now find that the audio is played via your TV now as you want.