Season the chicken on all sides with salt and pepper. Place the chicken breast side up on a steam rack with handles; set aside. On a 6-quart Instant Pot, select More/High Sauté. Add the oil and heat until shimmering. Add the onion and cook, stirring occasionally, until beginning to brown, about 8 minutes. Add the paprika and cook, stirring, until fragrant, about 30 seconds. Stir in the tomatoes, olives, orange juice and dried oregano, then bring to a simmer. Press Cancel, then lower the rack with the chicken into the pot.