I’m not sure if it’s possible. I think I read that they are unable to know if invoices are paid or not.
looking at https://ghst.to/.well-known/lnurlp/limited-azure-lizard it does not support NIP-57 Zaps. nostr:npub18yvpnchj7yaepjk8yz2pn66hfmmup505aqvx0lpyc3aree0g5fyq8clpz3 WEN?!?!?!
Discussion
Amboss is not, but Thunderhub is client-side on your node, and it should know whether it was able to unlock the HTLC with the preimage it got from Amboss, right?