You go to https://nwc.getalby.com and get the string there. the "export" link inside alby is an LNDHub string (which you can also use)
Discussion
LNDHub is better right now because you have balance and history on the wallet page:
https://void.cat/d/X9F4VP62Yo91R1F1tPsnhY.webp
But this uses regular HTTP(s) calls