RelayerRewards: StorageDescriptor<[SS58String, {
    bridged_chain_id: FixedSizeBinary<4>;
    lane_id: FixedSizeBinary<4>;
    owner: Enum<{
        BridgedChain: undefined;
        ThisChain: undefined;
    }>;
}], bigint, true, never>

Map of the relayer => accumulated reward.