They are transparently visible on boltz.exchange
Oh, I get it, is just about that channel. I thought it about more of them. You can probably do swaps chain/ln on something like nostr:npub1psm37hke2pmxzdzraqe3cjmqs28dv77da74pdx8mtn5a0vegtlas9q8970 but rebalancing will probably be cheaper, depends on the route. Don't know the Boltz fees.
Discussion
I thought Boltz only does lightning to on-chain?
Does it also do vice-versa, on-chain to lightning?