“I guess I’m just relatable,” says Liz Kingsman with a shrug in One Woman Show, her sharp, absurdist parody of the British TV series Fleabag and the wave of women’s solo confessionals that followed it. Kingsman plays a hyped-up version of herself in her play, a jobbing actor who is recording her self-penned solo show, Wildfowl, so that she can market it in the hope of becoming a major TV series.