[NTG-context] (ConTeXt LMTX) (Beginner) how do i set up vertical CJK?

https://pastebin.com/Cg8ZPDVK I have the code listed above and I am wondering how I can get CJK text to be in a vertical form (along with Vietnamese. I know l2r as an option exists in startalignment, but there seems to not be a vertical equivalent for vertical text. How do I achieve this?