Described here: https://twitter.com/peduarte/status/1621187086802980866?s=20&t=a8WakFD64i8W3BPDLIzfWg

Open silent-mention in Script Kit

// Name: Silent Mention
// Shortcut: opt x
import "@johnlindquist/kit"
let makeSilent = (str: string) =>
str.replace(/[.#@]/g, m => m + "\u2060")
let text =
(await getSelectedText()) ||
(await arg("Enter text to silent"))
let silentText = makeSilent(text)
await setSelectedText(silentText)