lemmy also (unofficially) supports footnotes.[^1] you may want to view this in a browser^[as it currently doesn't render in any mobile clients]^[also note the differing positions of the caret]
additionally, with no markdown linking at all, the web interface^[and i believe most apps] automatically turns [!community@instance.tld](/c/community@instance.tld)
into a link
[^1]: with two different syntaxes