Whisk together 1/4 cup low-sodium soy sauce, 2 1/2 tablespoons balsamic vinegar, 1 tablespoon honey, 3 crushed garlic cloves, 1 teaspoon Sriracha, and 1 teaspoon grated fresh ginger in a small bowl until combined.
Pour half of the marinade (about 1/4 cup) over the chicken in a large bowl, turning to coat all pieces. Cover and refrigerate for at least 2 hours or up to overnight.
Reserve the remaining marinade in the small bowl and set aside.
Preheat the air fryer to 400°F (200°C).
Remove chicken from the marinade, letting excess drip off, and place in a single layer in the air fryer basket (cook in batches if needed).
Cook the chicken 14 minutes, flipping once halfway through, until an instant-read thermometer reads 165°F (74°C) in the thickest part.
While the chicken cooks, pour the reserved marinade into a small saucepan and simmer over medium-low heat 1–2 minutes, stirring, until it reduces slightly and thickens into a glaze.
Drizzle the warmed glaze over the cooked chicken and garnish with sliced green scallion tops before serving.