Using the sauté or browning function of the Instant Pot, heat the oil until shimmering. Add onions, jalapeños, salt, and pepper. Cook until softened and lightly browned, about 5 to 7 minutes. Add garlic, chipotle, and oregano, stirring until fragrant, about 30 seconds. Stir in flour and cook for 1 minute. Slowly whisk in wine, scraping up any browned bits, until smooth.