You can get a SCART adapter that will provide an analog audio output that should work if your soundbar has an aux input. https/www.amazon.com/Scart-Composite-S-Video-Audio-Adapter/dp/B006RBMJ46
Set it to output if there is a switch to do so. If not make sure you get one that provides audio output
https/www.amazon.co.uk/d/Home-Audio-Video-Accessories/Skytronic-108-306-SCART-adaptor-3-5mm-socket-audio/B000BN6L8Q