Sprinkle salt and 1 tsp. jerk seasoning all over chicken; set aside. Warm 2 Tbsp. oil in a large nonstick skillet over medium-high heat. Cook chicken until browned on both sides and cooked through, 5 minutes per side.
In a large bowl, toss together remaining 1 tsp. jerk seasoning, jalapeño, scallions, lime juice, 2 Tbsp. canola oil and slaw mix. Season mixture lightly with salt. Place vegetable mixture on a large platter and top with cooked chicken breasts. Serve warm or at room temperature.