I have forwarded your request to the product managers. There is currently no aniseed-flavored yogurt at Migros. Because opinions are divided on the taste of aniseed and there is hardly any demand for it, there are currently no plans for such a yoghurt.
Or simply mix aniseed and other spices into the natural yoghurt. You can also add more or less sugar. If necessary, make up a spice mix, then mixing is very easy. En Guete!