e.g.

> [!NOTE] Title
> Some text...

Currently, you'd have to do something like this:

> ## 📝 Title
> Some text...

Which looks like:

📝 Title

Some text...

Not standard Markdown, and not at all de facto standard across the various Markdown forks and extensions, but supported by GFM and various software. Anything mirrored with GitHub that uses this syntax will look funky without support, e.g.:

There are alternative formats you could implement, but I would advise against it if compatibility with GitHub is desired.