It would be useful to have something like [knitr's comment code block](https://github.com/yihui/knitr/releases/tag/v1.37) to leave comments that are not included in the output.

input

````qmd
---
title: test
format: commonmark
engine: knitr
---

<!-- comment (to be output) -->

```{comment}
not to be output
```
````

output

````md
<!-- comment (to be output) -->
````

(I noticed that the output file has no title.  I reported this bug in another issue. #697)
cscheid
2022-04-20T10:05:09Z
eitsupi
enhancement
v1.2
closed
[Feature Request] Special code blocks for comments
https://github.com/quarto-dev/quarto-cli/issues/696