Use case

When rendering Markdown, it's common practice (as GitHub does) to change the style of nested ordered list.

1. first
2. second
   1. first
      1. first
      2. second
   2. first
      1. second

raw:
1. first
2. second
   1. first
      1. first
      2. second
   1. first
      1. second

However, flutter_markdown does not support it, so different styles cannot be applied at each level of nesting.

Proposal

If the bulletBuilder property is passed the nesting level as a parameter, it should be possible to customize the widget on the application side.

Example:

bulletBuilder: (int index, BulletStyle style, int nestLevel) => switch (style) {
  BulletStyle.unorderedList => const Text('・'),
  BulletStyle.orderedList => Text('${index + 1}-$nestLevel.'),
}

I followed the process from the Markdown widget, and since the nesting level is already managed internally.
So I think it can be implemented and gonna create some Pull request.