Green Chile Shrimp Scampi With Spaghetti

Name: Green Chile Shrimp Scampi With Spaghetti
Ingredients: 10 oz. spaghetti; Kosher salt; 1 lb. shrimp, peeled, deveined, tails left on; 4 Tbsp. extra-virgin olive oil, divided; 1 jalapeño, seeds removed if desired, thinly sliced; 4 garlic cloves, thinly sliced; 3 4-oz. cans diced green chiles; Freshly ground black pepper; 2 tsp. finely grated lemon zest, plus more for serving; ⅓ cup fresh lemon juice; 6 Tbsp. unsalted butter; Chopped parsley (for serving)