respective book and chapter structure added.

[bookstack] / dev / api / requests / books-update.json

{
  "name": "My updated book",
  "description_html": "<p>This is my book with <em>updated</em> details</p>",
  "default_template_id": 2427,
  "tags": [
    {"name": "Subject", "value": "Updates"}
  ]
}