Grilled Pineapple Guacamole

olive oil Half of 1 (20 oz.) can pineapple chunks 2 large avocados, pitted 1 Roma tomato, diced 1/2 red onion, finely diced 1 jalapeno pepper, seeded and finely diced 1/4 cup chopped cilantro 2 Tbsp. fresh lime juice (from 1 lime) Kosher salt and pepper