Chicken Paella

Name: Chicken Paella
Ingredients: 1/4 cup olive oil; 1 tablespoon dark chili powder; 1/2 teaspoon ground cumin; 1/4 teaspoon ground coriander; 4 bone-in, skin-on chicken thighs; Kosher salt and freshly ground black pepper; 1/4 cup extra-virgin olive oil; 1/2 cup diced yellow onion; 1/2 cup diced red bell pepper; 1/4 cup diced celery; 2 sprigs fresh marjoram; 1 sprig fresh thyme; 2 tablespoons minced garlic; 3/4 cup tomato puree; 2 cups long-grain rice; 4 cups chicken stock; 1/2 cup fresh cilantro leaves, chopped; 1 lemon; 2 ripe Hass avocados, sliced, for garnish; 1 cup chopped Castelvetrano olives, for garnish