Edit New Menu using SiteScript

Hi everybody, 

I would like to edit the new menu of SPO SiteCollections/Librarys using SiteScripts/SiteDesigns in the process of site provisioning. I am deploying ContentTypes which are shown in the new menu after the site is ready. The default templates (Word-Document, Excel-Document, ...) are not shown anymore. 

I was wondering if site script actions like this could solve the issue, but I couldn't work it out yet. 

{
  "verb": "addNavLink",      
  "displayName": "Word-Document",      
  "url": "{siteurl}/_layouts/15/new.aspx?DocTemplate={siteurl}/Shared%20Documents/Forms/template.docx"
}