Look at your Smart TV (model ?) and see what audio out ports you have available. Look at the Sony RV20 for any audio in ports. Did not note any on the back.
However, on the front there are pair of ports referenced as "Audio L/R" jacks which according to the specs are "phono" jacks.
So it should be doable. Post photographs of the TV and RV20 connections. Should be able to come up with a pairing that will work.
Hopefully all you need is an audio cable with the correct connectors on each end.