You can connect a bluetooth transmitter to the audio output of the TV. Check what kind of output the TV has and get one with that input. Check the TV manual on how to use the audio output and set it to PCM or stereo. Some TVs make you turn the TV speakers off to get the audio output to work.
Then connect a bluetooth receiver to one of the line level inputs on the receiver.
Pair them.
The TV volume control will not affect the volume of the receiver so you can lower the TV volume and get all the sound from the stereo.
There are also non bluetooth solutions like this one
https

/www.amazon.com/TP-WIRELESS-Digital-Wireless-Transmitter-Receiver/dp/B01ISIZIW0/ref=sr_1_3?s=electronics&ie=UTF8&qid=1493398455&sr=1-3&keywords=wireless+audio+transmitter%2Freceiver