1. Combine rind, 2 tablespoons juice, and 1 tablespoon oil in a large zip-top plastic bag. Add chicken; turn to coat. Let stand 8 minutes.
2. Combine remaining 2 tablespoons juice, remaining 2 tablespoons oil, 1/4 teaspoon salt, and 1/4 teaspoon pepper in a bowl. Stir in tomatoes and feta cheese.
3. Heat a grill pan over medium-high heat. Coat pan with cooking spray. Sprinkle chicken with remaining 1/4 teaspoon salt and remaining 1/4 teaspoon pepper; grill 5 minutes on each side or until done. Top chicken with tomato mixture.