[sualfred]

It is possible, but not a one liner.

https://api.themoviedb.org/3/tv/airing_today or /on_the_air
->
for each result get tvdb/imdb by using http://api.themoviedb.org/3/tv/{show_id} + appending of external ids
->
for each external ID check if it's part of the library
->
use next_episode_to_air result

Edit:
I already thought about adding it to my addon, but since we Germans always have to wait ~1 year until a season arrives here in our country ¯\_(ツ)_/¯...
Jurial is right. A successor of the Next Aired Script is probably the better solution.