We have a Garden Party soup here: https://www.nutribulletrx.com/recipes.html
And Sweet and Spicy Carrot soup recipe in the Nature's Prescription for Optimum Health book that comes with the NutriBullet Rx. However, we don't have any soup recipes with Brussels sprouts at the moment. I'll keep that in mind for future recipe development.
In the meantime, try Pinterest. I get a lot of recipe inspiration from there. You can adapt the recipe to fit your NutriBullet or NutriBullet Rx.