In your case, it is better to store it in a JS file. The reason is, that changing of variant properties in QML files would need to overwrite the whole array when any of its entries changes which is slower than just modifying the array.
Thus create a js file named something like GameLogic.js and import that file in a qml file where you have access to. Consider this tutorial, which also uses a 2-dimensional-array:
PS: Please write in english so all users can understand