Non-standard syntaxe for JSON_OBJECT function

MariaDB has a non-standard syntaxe for JSON_OBJECT, and also does not accept the standard syntaxe (as defined in ISO/IEC 9075:2016):

Example 1:

select json_object('first_name', 'John', 'last_name', 'Doe');

MariaDB Result:

MySQL Result:

Example 2:

select json_object('first_name': 'John', 'last_name': 'Doe');

MariaDB Result: not works (You have an error in your SQL syntax)
MySQL Result: not works (bad SQL grammar)

1. Example 3:

select json_object(key 'first_name' value 'John', key 'last_name' value 'Doe');

MariaDB Result: not works (You have an error in your SQL syntax)
MySQL Result: not works (bad SQL grammar)

It would be nice to have MariaDB support the standard json_object syntaxe.

https://github.com/h2database/h2database/issues/3575
https://en.wikipedia.org/wiki/SQL:2016
https://www.iso.org/standard/78937.html?browse=tc