Specifing the start line number on code block

[mehm8128]

Is your feature request related to a problem? Please describe.

I'm writing programming learning text, and I want to specify the start line number on code block to show a part of the whole code.
The below is an example file.

index.js
```
const ddd = 'eee'
function aaa(){
const bbb = 'ccc'
console.log(bbb)
}
```

Then, when I want to show only this aaa function, I want to let vitepress show as below(I want to start the line number with 2).

2 function aaa(){
3 const bbb = 'ccc'
4 console.log(bbb)
5 }

But with current features of vitepress, we cannot realize it.

Describe the solution you'd like

I suggest below writing rule.

```js @2
function aaa(){
const bbb = 'ccc'
console.log(bbb)
}
```

or

```js:line-numbers @2
function aaa(){
const bbb = 'ccc'
console.log(bbb)
}
```

With @, I want to specify the start line number(of course, other than @ is also ok).

Describe alternatives you've considered

No response

Additional context

HackMD allows to specify the start line with below way.
https://hackmd.io/features?both#Code-Block

Validations

• Follow our Code of Conduct
• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.

[ghost]

Hello, maybe you try writing it like this in your markdown files：

``` js
<!--@include: ./parts/index.js{2,}-->
\```

please ignore \ before ```
The number '2' means the start line.

official docs refrence

[mehm8128]

Thank you, it worked as I expectedly!!!
I close this issue.

[mehm8128]

Sorry, even though I could show specified lines of file, but line number is starting with 1...

[brc-dd]

now available in rc.12. refer #2917 for details