Via our API, yes.
Not via https://boltz.exchange, as from our current PoV it doesn't make much sense to offer Bolt12 in Boltz Lighnting -> Chain swaps. Boltz swaps at boltz.exchange are inherently single use. If you think it'd make sense, let us know with some details about your use case.
What I'd recommend in order to have this as end-user friendly feature: push for getting the memo feature in Misty Breez, talk to the awesome folks nostr:nprofile1qyt8wumn8ghj7etyv4hzumn0wd68ytnvv9hxgtcpzamhxue69uhkvun2daekstnwdaehgu339e3k7mgqyzt3r5dt4qr28g59lulg05t4jqkz7fg8gxrqm8r9jq7gkh5x867cz3f3ytq
