can stir fry veggies be used for soups?

So I have this bag of froz veggies (https://www.target.com/p/organic-frozen-stir-fry-blend-10oz-good-38-gather-8482/-/A-79578279) and I've been on a big soup kick. I know that frozen veggies should be added at end of soup making (unless I'm wrong?), but I was wondering if there are any particular style of soups this combo would work for or are stir fry veggies just for frying?