APPEND('[{"name": "Ann", "age": 22}},{"name": "John"},{"name": "Peter", "age": 30}]', '{"name": "Jane"}', '{"name": "Rachel", "age": 30}') returns [{"name": "Ann", "age": 22}},{"name": "John"},{"name": "Peter", "age": 30},{"name": "Jane"}, {"name": "Rachel", "age": 30}]