Nielsen is launching a new product aimed at shoring up the accuracy of its TV ratings system: a series of datasets meant to quantify a program’s “bingeability,” along with a show’s propensity to keep viewers coming back for more episodes down the line. The ratings giant explained in a statement Thursday that streaming services and major networks could each use this data to figure out which shows are better at wooing new viewers or retaining old ones. These insights are coming courtesy of a metadata-centric company called Gracenote, which Nielsen acquired back in 2017 to provide its clients with “deeper...