How can i print the original Inline code instead of the converted text?

What I am trying to do is to parse only headers and then get the original text without parsing the string.
Something like:

# This is a header
Hello **everyone** this is a list:
- Item 1;
- Item 2

And I've done something like this:

      string chapterContent = "";
      foreach (var element in document.Descendants()) {
                    if (element is HeadingBlock header) {
                        var chapterTitle = header.Inline.FirstChild.ToString().Trim();
                    }
                    else if(element is ParagraphBlock paragraph) {
                        chapterContent += paragraph.Inline.FirstChild.ToString()
                    }
      }

But The result is:
Hello everyone this is a list: Item 1; Item 2

Instead of:

Hello **everyone** this is a list:
- Item 1;
- Item 2

Because I want to maintain the original code, then I suppose the "ToString()" is not what I am looking for.

Start by tracing how HeadingBlock and ParagraphBlock expose their Inline content and what ToString() returns for those nodes. Determine whether the parser retains the original Markdown source for the requested elements; done means extracting the heading and surrounding text with emphasis and list markers preserved.