I don't recommend replacing chopped tomatoes with tomato paste, homemade tomato sauce, or marinara sauce because we have very few ingredients in this dish, and tomatoes contribute to the final result of the dish with their texture. If you don't have fresh tomatoes, you could use them instead of canned or crushed tomatoes. You can still use homemade tomato sauce, marinara sauce, tomato paste, or even vegetable broth in case you have leftovers and the stew has dried up; this way, you can still add some moisture while adding flavor. Remember that you may need to adjust the flavors with some garlic powder, salt, and maybe some extra virgin olive oil.