Chocolaty Strawberry Finger Crepes

1 1/4 cups milk
2 whole eggs
1/2 cup plus 2 tablespoons strawberry preserves, divided
1 cup all-purpose flour, sifted
2 tablespoons unsalted butter, melted
Nonstick cooking spray
1 cup Nutella
2 tablespoons confectioners' sugar
Whipped cream (optional)
Sliced strawberries (optional)

For the batter, pur