Support for Code Annotation in Epub

[vfacta]

Description

Hi! I noticed the code annotation circles are presented just as Line N and are not shown in code block in the epub output, whereas it is fully functional in html and pdf formats. Can the circle feature be supported for a future release of quarto?

Version:

quarto --version
1.3.361

MWE:

---
title: "Untitled"
format: epub
---

```python
print("Hello") # <1>
```

1. This is a test

```c
#include <stdio.h>
 
main()
{
    int a, b;  /* <1> */
 
    a = 2;
    b = 3;

    printf("%d + %d = %d\n", a, b, a+b);
}
```

1. More than one variable can be declared per line

quarto render test.qmd --to epub

test.epub:

[mcanouil]

This is currently by design as explained in https://quarto.org/docs/authoring/code-annotation.html with the example of "GitHub Flavored Markdown".