*Section* word count for Google Doc - 23/12/2017 12:25 EST

Let's suppose I have a novel in Google Docs. The entire novel is in a single document, with its parts (chapter, section, etc.) marked by headings. We want a way to know the word count of any section (let's say a chapter) independent of other sections, without the need of selecting any text. More specific, we want a sidebar with the document TOC (like an Outline) with a word count for every section on it. The important thing is that the add-on needs to use the TOC provided by Google Docs, so it can understand the different level, for each level will include the word count of any text bellow its level, including other section entirely. Refer to the screenshot for more details.