You can receive and send via lightning, but it works using Boltz for swaps, which is a non-custodial AKA non trusted system for swapping sats in different systems like onchain, Liquid and Ark The functionality might be broken sometimes because it's still experimental but when it works it feels seam...

From what I can tell, it does https://image.nostr.build/d3a4c207ae14e078f0befb426a90f8bb9b4a793f281fdfb83b3a328b5e82d605.jpg