Chocolate and Cinnamon Bread on Bread Pudding

Name: Chocolate and Cinnamon Bread on Bread Pudding
Ingredients: 1 large cinnamon-raisin bread boule, at least 1 day old or lightly toasted; 1/2 cup whole milk; 1/2 cup heavy cream; 4 tablespoons (1/2 stick) unsalted butter; 1/3 cup granulated sugar; 1 teaspoon vanilla bean paste; 3 large eggs, whisked; 1/2 cup chocolate chunks; Nonstick cooking spray, for the parchment; 2 tablespoons demerara sugar; 1 teaspoon ground cinnamon; 1/4 teaspoon kosher salt; 2 cups heavy cream; 1/4 cup granulated sugar; 1 tablespoon ground cinnamon; Pinch of kosher salt