I have now finished the change I suggested, but with a minor change.
The user will not be setting the earlier suggested
#+language: zh keyword.
ox-hugo will try to get the locale of the user from some default environment variables (see https://ox-hugo.scripter.co/doc/chinese-support/).
If that does not work automatically, user can explicitly specify the locale to be Chinese by adding
#+hugo_locale: zh keyword or
:EXPORT_HUGO_LOCALE: zh property to a subtree’s property drawer. (Any local string that begins with “zh” will work, like “zh_CH”).
* Filling automatically not preserved for Chinese characters (preserve filling on)
Ensure that multi-byte characters are force-unwrapped if the locale is
manually set or auto-detected as Chinese.