You can now use array and object literal syntax in formulas to create objects and array.

// old way
ARRAY(1, 2, 3)

// new way
[1, 2, 3]

// old way
OBJECT("key1", "value1", "key2", "value2")

// new way
{ key1: "value1", key2: "value2" }

You can omit quotes around object keys unless they are needed (e.g. if using a key with a space in it)