14
You could do that now if you're comfortable opening the browser dev console.
In the page listing your communities you can run:
[...document.querySelectorAll('a[title^="!"]')].map(elem => elem.href).sort()
and it'll output something like
[
'https://lemmy.ml/c/android',
'https://lemmy.ml/c/animals@beehaw.org',
// ...
]