Connect ssh to a server
Type ~ ⟩ printf $'\e]52;c;%s\a' "$(base64 <<<'hello world')"
Even without ssh you can do locally the same command the clipboard is untouched

System

Ubuntu 22.04
alacritty 0.14.0-dev (d4f2f85)
~ ⟩ uname -r
6.8.0-48-generic