Select items in Array that doesn't exist in another Array

SQL++
1

Ive a simple document with two arrays with in it as below.

I want to select items in Array A that doesn’t exist in Array B.

{
    "id":"234233232311",
     "A": ["1234", "1233", "1222"],
      "B": ["1234", "1233", "1225"]
}

In the above doc, the item in Array A (1222) need to be selected in query result as it doesn’t exists in B.

How can I achieve with N1ql?

2 
SELECT  
           ARRAY va FOR va IN A WHEN va NOT IN B END res

FROM default
WHERE .....;