MySQL 8.0

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select version();

version()

8.0.12

select JSON_OBJECT('test', BIN_TO_UUID('Ç~p’Ú[£´Æ'));

JSON_OBJECT('test', BIN_TO_UUID('Ç~p’Ú[£´Æ'))

{"test": "c3877e70-e280-99c3-9a5b-c2a3c2b4c386"}

select JSON_OBJECT('test', BIN_TO_UUID('GÇ~pw–’Ú¦[¦£´Æ'));
Incorrect string value: 'GÇ~pw–’Ú¦[¦£´Æ' for function bin_to_uuid

select JSON_OBJECT('test', LENGTH('GÇ~pw–’Ú¦[¦£´Æ'));

JSON_OBJECT('test', LENGTH('GÇ~pw–’Ú¦[¦£´Æ'))

{"test": 25}