JSON functions were added in MariaDB 10.2.3.
 
Syntax
------ 
JSON_SET(json_doc, path, val[, path, val] ...)
 
Description
----------- 
Updates or inserts data into a JSON document, returning the
result, or NULL if any of the arguments are NULL or the
optional path fails to find an object.
 
An error will occur if the JSON document is invalid, the
path is invalid or if the path contains a * or  wildcard.
 
JSON_SET can update or insert data, while JSON_REPLACE can
only update, and JSON_INSERT only insert. 
 
Examples
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URL: https://mariadb.com/kb/en/json_set/