Place the pork chops in the bottom of the slow cooker.
In a bowl, whisk together the heavy cream, 1/2 cup chicken broth, lemon zest, lemon juice, 2 tablespoons of the dill, garlic powder, salt, and pepper. Pour this mixture over the pork chops.
Cover and cook on low for 6 hours until the pork is tender.
About 30 minutes before the pork is done, melt the butter in a saucepan over medium heat. Add the onion and cook until softened.
Stir in the rice and toast it for 1 minute. Pour in the remaining 2 cups chicken broth, bring to a boil, then reduce to low, cover, and simmer for 18 minutes until the rice is tender.
Fluff the rice with a fork and stir in the remaining tablespoon of dill. Serve the pork chops and sauce over the rice pilaf.