That character’s polyamory still features. We see her husband and her boyfriend, who love her and seem to love each other. The word “compersion” is used and defined (somewhat poorly, but whatever).
Of course, Orange is the New Black explores a wide range of relationships, and I already noted last season that there were other situations that could be ready as polyamorous in the broadest sense of the word even if that term was not used. Episode 4 (2017), however, much more explicitly played some of the other inmates relationships against that of the explicit polyamorist. Read more (& spoilers) under the cut.