Bing Cherry Walnut Oatmeal Crumble

1 1/2 pounds fresh Bing cherries, halved and pitted
1 cup apple juice
3/4 cup all-purpose flour
1 cup granulated sugar, divided
1/4 cup firmly packed light brown sugar
2/3 cup walnuts, toasted and chopped*
8 tablespoons unsalted butter, cut into pieces (1 stick)
1/2 cup old-fashioned (not quick-cooking) oatmeal, uncooked
1/3 cup cornstarch
Pinch of salt
1/4 teaspoon almond extract

Preheat oven to 350