Combine the coconut milk, yogurt, chia seeds, honey, and vanilla extract in a large mixing bowl, stirring well until everything is fully blended and smooth.
Cover the bowl and let the mixture rest for about 30 minutes, allowing the chia seeds to begin absorbing the liquid and thickening slightly.
Stir the mixture again thoroughly to break up any clumps, then cover and refrigerate for several hours until it reaches a pudding-like consistency.
Remove the pudding from the refrigerator and mix well, adding a little extra coconut milk if needed to loosen it to a smooth and pourable texture.
Add chopped mango pieces to serving glasses, then spoon the chia pudding over the top to create a layered effect.
Finish with additional mango and optional granola on top, then serve immediately for the best texture and flavor.