Heat oil in the pot over medium heat. Add onion, red bell pepper, yellow bell pepper, serrano, garlic, tomato paste, thyme, curry powder, paprika, cumin and salt. Cook, stirring occasionally, until the vegetables are softened, 2 to 3 minutes. Add the squash puree, tomatoes and coconut milk. Bring to a light boil; cook, stirring occasionally, for 10 minutes. Add the salmon and chickpeas. Reduce heat to medium-low and simmer, stirring occasionally, until the salmon is cooked through, 5 to 6 minutes.