中国語用JFM
tanukihee Thank you very much. This is very helpful, because I don't know much about Chinese typesetting rules.
\jfont \jSK="name:Source Han Serif SC:jfm=xjsh/kaiming" at 10pt % kaiming \jfont \jSQ="name:Source Han Serif SC:jfm=xjsh/quanjiao" at 10pt % quanjiao \jfont \jSB="name:Source Han Serif SC:jfm=xjsh" at 10pt % banjiao
tanukihee I have made 6 Japanese jfm files in my repo and combined the 18 jfm files into 3 files at this commit https://github.com/tanukihee/ChineseJFM/commit/cf6729573d356075af491b37a0ba003935aeb3d7.
I also combined the horizontal jfm and vertical jfm into one jfm file by using vert feature, and added prop feature for only kanas when punctuations do not need be proportional.
If there is no plan to add the Chinese jfm files into luatexja, the ticket could be closed.
Thank you very much. I'm going to add your jfm-zh_{CN,TW}.lua into LuaTeX-ja. (I didn't look into jfm-ja_JP.lua....)
I am happy to help you. The jfm-ja_JP.lua is just for fun. Many Chinese likes to use Japanese fonts to type Chinese articles so I wrote it. But I don't know if Japanese use these many punctuation adjustments 😂.
I roughly looked through Adobe InDesign's adjustments for Japanese and they are mainly about the punctuation at the beginning or the end of a line...
tanukihee Reply To (匿名)
Oh I forgot to login... It was my reply...
tanukihee I found I made a big mistake and fixed it in https://github.com/tanukihee/ChineseJFM/commit/2e3c3f0644092f5d7d0af7c67a4d9a7b8914c4aa 😥😥
If there are more necessary updates I will inform you at https://github.com/h-kitagawa/ChineseJFM by pulling requests.
tanukihee CTAN has received my upload and Chinese JFM works fine with luatexja. The ticket could be closed.
tanukihee 
Fork
I made some jfm files for Chinese and they could be used in either traditional or simplified Chinese, either horizontal or vertical writing mode. In each writing mode, three styles of jfm are provided and they are "quanjiao"(全角), "banjiao"(半角) and "kaiming"(开明). It's hard for me to use osdn so I update them to my github repo https://github.com/tanukihee/ChineseJFM . You can use them for free.
私は中国語用のJFMファイルを作りました。簡体中国語も繁体中国語も、横組みも縦組みも利用できます。全角・半角・開明式の約物調整方凡そ12種類が提供されます。OSDNが使えないので、GitHubでアップロードしました。アドレスは https://github.com/tanukihee/ChineseJFM です。ご自由にお使いください。