Maybe #[6] can help here.
Discussion
Until there's an official app on Umbrel you can try the one in my community appstore. By default it creates a random pubkey and secret that you can scan and use with Amethyst.
It can be used with lnbits instead of umbrels lnd, with some terminal configuration if that's something you're looking for. Dm me for more details.
It looks nice and I just learn that we can add custom repo to Umbrel. I will try another day, with LNbits because I don't want to expose all ssts in my node to a zap wallet obviously.