Blocking the chewing sounds out by making own chewing sounds (works as long as hunger and food are present)

Turning on low volume music with the agreement of the other people at the table (preferable wide range frequencies like an orchestra, and not just a piano for example, so the sound scape is large and covers more annoying sounds)

Leaving the table temporarily with an excuse. Offering doing some kitchen work, getting something from the fridge (walking quite slowly), or a quick break at the bathroom (also possible: “I forgot to wash my hands, excuse me for a minute please”)