In bowl, toss plums with 2 tbsp. sugar, five-spice powder and lemon juice. Divide among 4 small ramekins. In bowl, using fingertips, mix oats, butter, flour and remaining 6 tbsp. sugar with a pinch of salt; sprinkle on plums. Bake at 425 degrees until topping is golden and juices bubble, 15 to 18 minutes.