Thanks for your replies.
I'm trying to improve the the sound from the TV speakers of a second TV, so thought I could have the sound come from Alexa instead.
I have a Fire Stick that does exactly that on another non bluetooth TV, by diverting the TV sound to my other Alexa.
This option of course only works within the fire stick's own programme's, and not the TV's tuner.
I've checked the audio output on the second TV (Panasonic TX P50VT), and there is no audio out option within the setup menu.
Further research has led me to believe that my TV requires external speakers\soundbar etc to be connected via a HDMI- ARC connection for these to work. My TV has Optical out, Component, headphone ports, and the usual HDMI \ USB
I just thought I could plug a BT transmitter using the supplied stereo jack, from the TV's 3.5mm headphone port, and BT connect to Alexa for sound.
It's no big deal, just a thought......