将json对象数组插入postgres的查询

我有一张带字段的桌子 fields json[] . 我已经创建了一个函数来将记录插入到该表中,下面是调用

select * from add('[{"name":"Yes","value":"yes"},{"name":"No","value":"no"},{"name":"Neutral","value":"neutral"}]') as result;

这里是函数本身

CREATE OR REPLACE FUNCTION public.add(
    _fields json[]) RETURNS SETOF json 
LANGUAGE 'plpgsql'
AS $BODY$
     DECLARE
        query text;
    BEGIN
        insert into my_table(fields)
          values(_fields);
        query = 'SELECT json_build_object(''message'', ''Added.'')';
        RETURN QUERY EXECUTE query; 
        END;
$BODY$;

但这表明

malformed array literal: "[{"name":"Yes","value":"yes"},{"name":"No","value":"no"},{"name":"Neutra

然后我试了这个

select * from add('{"name":"Yes","value":"yes"},{"name":"No","value":"no"},{"name":"Neutral","value":"neutral"}') as result;

这个insert语句的函数如下

insert into polls(fields) values(array([''||_fields||'']::json[]));

这是在展示

syntax error at or near "["