Yes, I personally would like to see Chinese and Japanese. I would happily pay for Grammarly-like daily use tool as well, in fact, for Chinese. From what I know, there is no such tool for Chinese language whatsoever.
The service I use for automatic corrections is LanguageTool (https://languagetool.org/), and they support Chinese. It's hard for me to judge the accuracy, but I know that for Spanish it's good at picking up grammar and spelling mistakes.
I just tried very simple inherently wrong Chinese phrase "我学校中文。" and it found no mistakes in it. I expected it at least point to the error or even suggest to correct the second word to become "我学习中文。"
