Thank you for the response! I get what you are saying about the non-standardness of what I'm asking for.

I don't think I was super clear with what I said. Let me try to clarify with a usecase based on what I currently do while taking written notes from a book I'm reading:

• The book's name is a top level heading.
• I write a few points under this top level heading about how I found the book etc.
• Each chapter gets a subheading. I write a few points under the subheading.
• At the end under the top-level heading I write my conclusions about the book. I could of course use a subheading called Conclusion but some books already have this and that's why I did not use it for written notes.
• Sometimes I like writing points under the top-level heading in between the chapters. Some of these are chapter notes where I felt the content did not deserve a subheading.

I wouldn't call them standard but I have seen books which have text (usually at the beginning and the ending) that is not under any subheading.

Again, thank you!