Lucas Hnath set out to write a sequel to Ibsen’s famous play, imagining the future of protagonist Nora Helmer. His producer, Scott Rudin, proposed a playwriting method you might call dial-a-feminist. Hnath reached out to several academics, including Susan Brantly, who teaches Scandinavian literature at the University of Wisconsin-Madison, and Toril Moi, an Ibsen scholar at Duke and the author of “Sexual / Textual Politics: Feminist Literary Theory.”