Is it possible to export keys from a Lightning Wallet, specifically lnd? I started opening my first channels, and most of what I'm reading says that you want to monitor your wallet balance (in the absence of watchtowers, which aren't implemented yet). I was looking to get the public key for my Lightning wallet so I can have a watching-only copy. I suppose I can do that by just having the address with some wallets, but it would also be nice to have the raw private keys for backup.

I know how to get the keys out of a normal bitcoin wallet, but not sure how to do that with lnd, since they're stored in wallet.db.