Currently, the bridge only supports traveling from BNBChain to another EVM chain and back. If you want to go from Ethereum to Harmony One, you first would need to bridge to BNBChain and then bridge to Harmony One. BNBChain is the center hub around everything in our ecosystem. This will be changed after the introduction of CCIP, where users can bridge their tokens in a decentralized way powered by Chainlink oracles introducing the NFT Bridge v2.