Craft the Herbaceous Spread: In the small mixing bowl, combine the Greek yogurt, fresh lemon juice, black pepper, garlic powder, and chopped dill. Stir with the spatula until the mixture is smooth and evenly combined.
Prepare the Fillings: Thinly slice the pre-cooked chicken meatballs. If you haven't already, grate the English cucumber and use your hands or a paper towel to squeeze out as much water as possible. Finely dice the red bell pepper.
Establish the Base: Lay the four tortillas flat on your work surface. Using the spatula, divide the yogurt spread evenly among them, leaving a ½-inch border around the edges to prevent spillage.
Layer the Elements: Arrange a uniform layer of baby spinach over the yogurt spread on each tortilla. Distribute the sliced meatballs, grated cucumber, and diced red bell pepper evenly over the spinach.
Form the Spirals: Starting from the edge closest to you, roll each tortilla up tightly into a compact log. The spread will help the final edge adhere.
Portion and Pack: Slice each rolled wrap into two equal halves on a diagonal. You can also slice them into 1-inch thick pinwheels. Arrange the wrap portions in the main compartment of your lunch containers. Add the cucumber spears and green grapes to the side compartments. Seal and refrigerate until ready to eat.