Hawaiian Chicken Kebabs

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1 tablespoon vegetable oil, plus more for brushing

3/4 cup ketchup

3 tablespoons soy sauce or teriyaki sauce

3 tablespoons apple cider vinegar

1 1/2 tablespoons honey

1 1/4 pounds skinless, boneless chicken breasts, cut into 1 1/4-inch pieces

1 8-ounce can water chestnuts, drained and rinsed (optional)

4 cups chopped pineapple (about 3/4 pineapple)

1 small red or orange bell pepper, cut into chunks

Kosher salt and freshly ground pepper

4 small Hawaiian sweet rolls