colon fence syntax is broken by escape character

[arwedus]

Describe the problem

In case of a colon fence:

:::{NOTE}

README.md should contain the component or package name in it's title.
Using only README as title will lead to lots of "README" items in the outline of the generated documentation.
:::

mdformat produces:

:::\{NOTE}

README.md should contain the component or package name in it's title.
Using only README as title will lead to lots of "README" items in the outline of the generated documentation.
:::

Ideally, mdformat with mdformat_myst would respect this syntax and not escape it.

To me, it is not even clear why mdformat escapes curly brackets in the first place.

Link to your repository or website

No response

Steps to reproduce

1. "pip install mdformat_myst"
2. Put the above example in a .md file
3. run "mdformat filename.md"

The version of Python you're using

3.8

Your operating system

Ubuntu 20.04

Versions of your packages

mdformat==0.7.10
mdformat_frontmatter==0.4.1
mdformat_myst==0.1.4
mdformat_tables==0.4.1

Additional context

No response

[welcome[bot]]

Thanks for opening your first issue here! Engagement like this is essential for open source projects! :hugs:
If you haven't done so already, check out EBP's Code of Conduct. Also, please try to follow the issue template as it helps other community members to contribute more effectively.
If your issue is a feature request, others may react to it, to raise its prominence (see Feature Voting).
Welcome to the EBP community! :tada:

[hukkin]

The plugin only supports syntax extensions that are on by default in MyST. Colon fence is not a supported syntax currently.

[adamgayoso]

Will this be supported in the future?