There's no reason to send audio from your TV receiver to your Mi Box. What you're really asking is "can I connect my Mi Box to my receiver via bluetooth?" which is an entirely different question.
phrostbyt
yes with HDMI-ARC
ifixpedals
I must ask: Why? What are you trying to achieve? Are you trying to record something?
There's no reason to send audio from your TV receiver to your Mi Box. What you're really asking is "can I connect my Mi Box to my receiver via bluetooth?" which is an entirely different question.