Hey there, I get exactly what you're asking for—those handy pre-saved text blocks you can pop into your message with a single click or tab, just like in VS Code. Let's cut to the chase:

Slack doesn't have a native feature for this exact functionality. The official "code snippets" feature you've already looked into is only meant for sharing code blocks with your team, which is totally not what you're after.

But don't fret—there are solid workarounds to get that same time-saving behavior:

• Slack's Built-In Saved Messages (Quick Replies)
  This is the closest native option. You can save any frequently used text (templates, canned responses, even code snippets) as a saved message, then insert it in seconds:

  1. Type out the text you want to save in the message input field
  2. Hover over the text, click the three-dot menu (⋮)
  3. Pick "Save message"
  4. To use it later, click the lightning bolt (⚡) in the input box, search for your saved message, and click to drop it right in

• Third-Party Text Expansion Tools
  If you want tab-triggered or shortcut-based insertion, tools like TextExpander or PhraseExpress work perfectly with Slack. Just set up a shortcut (like !projupdate) for your pre-written text, type the shortcut in Slack's input box, and it'll auto-expand to your full snippet instantly.

• Custom Slack Bots (For Teams)
  If you're part of a team, you can build a simple custom bot to store and retrieve snippets. For example, you could send a command like /savesnippet standup "Daily Standup Notes:..." to save it, then use /insertsnippet standup to pull it into your chat. It takes a bit of setup, but it's a flexible solution for team-wide snippet use.

内容的提问来源于stack exchange，提问作者アリ・ナディム