macOS Big Sur - Set quick look provider for specific file types?

My default app to open .md markdown files is VS Code, which unfortunately doesn't provide quick look support for markdown files:

I've installed other apps that provide quick look for markdown files, how do I make quick look to use them without changing the default app for opening markdown files?

There is a way to authorize QLMarkdown. I have two Big Sur Macs: personal I bought with Catalina and upgraded to Big Sur, and my most recent work Mac purchased with Big Sur on it. The personal Mac never complained about QLMarkdown, because I had trusted it before? To get it running on the work Mac I

• Waited until the untrusted plugin dialog came up, or force it with qlmanage -p <path-to-markdown-file>.
• Opened System Preferences to the Security & Privacy section, General tab.
• There was a message stating QLMarkdown was "blocked from use because it is not from an identified developer", and a button labeled Allow Anyway to trust the unsigned QLMarkdown, I clicked it.
• Tried to QuickLook a Markdown file.
• The dialog about running untrusted software came back up, and I was able to click a button saying I trusted it this time.

AFAIK, the default app for opening documents and the QuickLook generator for previewing them are two completely separate things.

If you have a QuickLook generator file for the .md format, then that will be used by the QL manager.

The Terminal command qlmanage provides a way to get the status of the QL manager, and to configure it in a limited way.

> qlmanage -m | grep "md"
  com.unknown.md -> /Users/Ben/Library/QuickLook/QLMarkdown.qlgenerator (1.3.3)

You can force which QL generator is used with

qlmanage -g /path/to/generator/