Dude, you are literally wasting your time.
I work with Litchi for beta-testing, and I've already broached this subject with him.
It is unable to do with Autel drones what it does with DJI's SDK. Autel on its Pixhawk (ardupilot) based flight platform is unable to program smooth flights, turn mode, gradual altitude etc., finally what DJI is able to do.
It would be a waste of time for him and an unprofitable project compared to
1) To the number of Dji in flight compared to Altar.
2) Not enough clientele.
3) Autel does not play in the same playground as Dji
Also, it seems to me that the Lite does not have the Waypoints mode in its flight modules
Anyway, it will not be able to do better than Autel in the flight programming that the Evo(s) do.