Hi Jones,
I am glad that you liked the video tutorial. If you want to write an ArduPy library, you need to follow the steps explained in the video and I am afraid there is no other way. You could also have a look at our wiki on how to write an ArduPy library:
As per your request, I have converted the Wio Terminal Backlight Arduino Library into an ArduPy Library and you can follow this repository to download it:
Also, check the README.md file in that repository to access the example code so that you can copy into your Wio Terminal and test it out!