If you monitor has a headphone jack - that would be the easiest way.....
They make adapters - here is one example: http
/www.rakuten.com/prod/hdmi-to-hdmi-optical-5-1ch-rca-3-5mm-headphone-out-audio-extractor/267471362.html?listingId=343274346&sclid=pla_google_ACEPurchaseInc.&adid=29963&gclid=CjwKEAjwtIShBRD08fKD1OWSik4SJAAuKLovDTe1fyG7_3iPfRd-oNO1-feKEKVKd_KYmF71SeG8qhoC1JTw_wcB