Chicken and Green Papaya Salad

Name: Chicken and Green Papaya Salad
Ingredients: 4 small skinless, boneless chicken breasts (about 1 pound total); 1 tablespoon reduced-sodium soy sauce; 1 teaspoon sugar; 1/4 teaspoon Chinese five-spice powder; Kosher salt, freshly ground pepper; Vegetable oil (for grilling); 2 garlic cloves, finely chopped; 2 tablespoons fresh lime juice; 2 teaspoons sugar; 1 teaspoon fish sauce; 1/2 large green papaya and/or 2 green mangoes, julienned; 1/2 medium cucumber, peeled, julienned; 1 small daikon (Japanese white radish), peeled, julienned; 1 medium carrot, peeled, julienned; 6 scallions, julienned; 1 Fresno chile, with seeds, finely chopped; Kosher salt; Banana blossom petals (for serving; optional); 2 tablespoons toasted sesame seeds