Random array of a set of items

#1

How do I create a row that generates a random array of a set of items? I don’t want the items inside the arrays to be random, just the array for each row.

For example:

{
  ["image1.jpg", "image2.jpg", "image3.jpg"],
  ["image4.jpg", "image5.jpg", "image6.jpg"],
  ["image7.jpg", "image8.jpg", "image9.jpg"],
}

Thanks!