Heat your grill to a medium-high setting.
In a mixing bowl, combine the shredded rotisserie chicken with the barbecue sauce until well-coated.
Grill the diced pineapple for about 3-4 minutes, turning occasionally until charred.
Remove the pineapple from the grill and chop into bite-sized pieces.
On a large platter, arrange the corn tortilla chips in a single layer.
Spoon the BBQ chicken mixture over the chips, followed by the grilled pineapple and grated Monterey Jack cheese.
Transfer the platter to the grill and cover it, cooking for 5-7 minutes until the cheese is melted.
Remove the platter and top with pickled jalapeños, fresh cilantro, and chopped scallions.
Serve hot with a side of Greek yogurt for dipping.