If you have a TV tuner in the boot, you can add an AUX in cable (or two) and plug in a stereo bluetooth gateway behind the trim. You can use it plugged permanently into the cigar lighter next to it but as it is powered on permanently, your phone won't pair automatically.. I (eventually) added a relay with a trigger from the Park Distance Control's switched 12V and when I get in the car, it powers up and polls the phone to connect.
I used this one after trying a few...
https://www.aliexpress.com/item/32717265164.html
EDIT* I think you also need VCDS to activate the AUx in menu options on the MMI.