Amazon URLs are a mess, but I still think it's easier to search for things in a web browser and add stuff to your queue. If you go to a title you already know, you can find the "International" subgenre. I think that's the best way to find all their Asian dramas, rather than trying to do so via Amazon's "Drama" category. From International you can choose a regional subcategory.

Try this: https://tinyurl.com/99b436f4