AWS Appsync : How use filter with an array?

Question

On my Amplify App, I am use this model:

type Post
  @model {
  id: ID! 
  title: String!
  level: Int!
  categories: [Int!]
}

It's easy to filter post by level.
Example: Retrieve all posts that have level 3

I am using this code:

const response = await API.graphql({ 
    query: listPosts, 
    variables: {
        filter: {
            level: {
                eq: 3
            }
        }
    }
});

My problem is with the categories parameter.

Example: How retrieve all posts that have category 2? How retrieve all posts that have category 3 and 5?

Can you help me?

Regards