Inline markdown files do not support inlining by header

[Scripon]

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

https://vitepress.dev/zh/guide/markdown#markdown-file-inclusion

The above link suggests: support markdown full text inline or selective inline by line number.

If the line numbers are inline, this can cause unexpected problems if the embedded markdown file changes in the future (line numbers change)

Describe the solution you'd like

inline by header (H1, H2, H3, etc.)

Describe alternatives you've considered

No response

Additional context

No response

Validations

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