Oh you don't need a plugin, just add plain file on your server: 
Use your own domain as lightning address | Alby Account | Alby Guides
How to use your Alby lightning address with own domain?
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but check upcoming walias.io by @El Gorila 🇦🇷
Exactly what I’m looking for 🙏
Alby the 🐐 as usual 🫡