Unfortunately whilst NOW TV have done well getting subtitles onto a lot of films on the Sky Cinema Pass, they have yet to start rolling out on the Entertainment Pass. The only new show that provided subs was Game of Thrones S7 which has now left. Currently you'll only find them on
Alan Partridge's Mid Morning Matters season 1
You, Me and the Apocalypse season 1
Bring the Noise season 1
They should start rolling out at some point, but in the short term probably not.