Sorting lists In Freedom UI

Does anyone know if it is possible to sort a list on load, by multiple columns? I spotted this array in the code, but adding another column to sort doesn't make a difference.

Thanks!

"sortingConfig": {
							"attributeName": "ItemsSorting",
							"default": [
								{
									"direction": "asc",
									"columnName": "UsrPax"
								},
 
								{
									"direction": "asc",
									"columnName": "UsrNights"
								}
							]
						}