Google Chrome extensions update settings or Preferences file?

Question

I found the brower whether display bookmarks bar by Settings in the option "Always show the bookmarks bar", it is relative "...Google\Chrome\User Data\Default\Preferences" file:

{
   ......
   "bookmark_bar": {
      "show_on_all_tabs": false
   },
   ......
}

How can I control the "bookmarks bar" option by API or the file?

Answer 1

I found that Google could not support the relative API by Google search.