For now, I have just saved it in my clipboard application, so I copy-paste.
When it goes out of history, I just open a file, where I have saved it and copy from there. So it’s pretty crude.
I was hoping that either the KDE Social web interface would add a “Signature” feature or I would pick some Lemmy application that would allow that, but for now it’s just this.
Perhaps, if I feel like it’s being too frequent, I may set a compose key for it.