In a shuffle, the eighth note (or rest) on the beat is always longer, and the eighth note off the beat is always shorter. Even if they are tied, this persistent groove should remain the same. If there are any triplet eighth notes you just play them normally as they already fit into the groove.
I wouldn't bother with trying to translate it out into notation software. You could listen to the actual ABBA song to get a general feel of the groove if you need to.