Heat a grill pan over medium-high heat; lightly coat with cooking spray. Combine garlic powder, cumin, 1/2 teaspoon salt, and pepper in a small bowl; sprinkle over chicken. Add chicken to pan; cook 10 minutes on each side or until done.
Meanwhile, combine remaining 1/4 teaspoon salt, pineapple, and remaining ingredients in a medium bowl. Serve relish over chicken.
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