Whisk oats, almond milk, yogurt, almond butter, chia seeds, cocoa, maple syrup, vanilla and salt together in a large bowl until combined. Let stand until set and thickened, 5 to 8 minutes.
Meanwhile, stir coconut oil and 2 tablespoons chocolate chips together in a small microwave-safe bowl. Microwave on High for 30 seconds. Stir until the chocolate chips are completely melted and incorporated into the oil.
Divide the oat mixture among 4 (8-ounce) jars (about 1 cup each). Spoon about 2 teaspoons each of the melted chocolate chip mixture over the oat mixture in each jar, tilting the jar to cover the entire surface. Immediately sprinkle with cacao nibs and the remaining 1½ teaspoons chocolate chips.
Let stand until the chocolate layer is set, about 2 minutes; cover with lids. Refrigerate for at least 12 hours (or up to 4 days).
