I would think the millet seeds would have too much oil and fat, the same reason chins shouldn't have nuts.
The timothy hay is great, but the dried cranberries are too much sugar for a chin to digest. Some people do feed raisins and dried fruit as an occasional treat, but it's not advisable as it can lead to bloat and other digestive issues. Perhaps you can shake the handfuls of hay to separate the fruit out before you give the hay to your little ones.