You will need to buy a bluetooth sender / transceiver ... like this one below:
Plug it into the audio out socket on the TV ... then pair it to your headphones.
http

/www.alltech.com.au/en/cables-adaptors-/289-bluetooth-35-a2dp-stereo-audio-adapter-dongle-sender-transmitter-for-tv-speaker.html?gclid=Cj0KEQiA-_HDBRD2lomhoufc1JkBEiQA0TVMmvFUMtFpsKZhUcMiyAFC5zPOW466jsYLZqnoGd4o0FYaAt7T8P8HAQ