Multi-byte unicode glyphs like CJK and emoji characters need to be represented as quoted Unicode escapes for use as JSON keys or values.
You can use, for example, the Keyboard Maestro
Quote for JSON filter:
Quote CJK characters for JSON.kmmacros (2.9 KB)
On in a key, rather than a value:
Numeric and (quoted CJK)characters in JSON keys.kmmacros (3.5 KB)
3q!，its very userful!!!!
and for decoding:
三球.kmmacros (2.9 KB)