How to deal with KtonERC20 precompile Approves storage?

[boundless-forest]

struct Approves;
impl StorageInstance for Approves {
	const STORAGE_PREFIX: &'static str = "Approves";

	fn pallet_prefix() -> &'static str {
		"KtonERC20"
	}
}

type ApprovesStorage =
	StorageDoubleMap<Approves, Blake2_128Concat, H160, Blake2_128Concat, H160, U256, ValueQuery>;