Description of json_value_return_type
{ VARCHAR2 [ ( size [BYTE | CHAR] [ TRUNCATE ] ) ] | NUMBER [ ( precision [, scale] ) ] | DATE | TIMESTAMP | TIMESTAMP WITH TIME ZONE | CLOB | SDO_GEOMETRY }
{ VARCHAR2 [ ( size [BYTE | CHAR] [ TRUNCATE ] ) ] | NUMBER [ ( precision [, scale] ) ] | DATE | TIMESTAMP | TIMESTAMP WITH TIME ZONE | CLOB | SDO_GEOMETRY }