1. i tried to find word api for that but i guess that is not available right now so i thought i can do it by modifying the xml but that
   also didn't work, need to change page size margin and document
   language

     await Word.run(async (context) => {
    var paragraphs = context.document.body;

    // Queue a command to load the style property for the top 2 paragraphs.
    paragraphs.load("style")

    // Synchronize the document state by executing the queued commands,
    // and return a promise to indicate task completion.
    return context.sync().then(function () {
      // let replacedXml=""
      // Queue a a set of commands to get the OOXML of the first paragraph.
      var ooxml = paragraphs.getOoxml()

      // Synchronize the document state by executing the queued commands,
      // and return a promise to indicate task completion.
      return context.sync().then(function () {
        // console.log('Paragraph OOXML: ' + ooxml.value);
        console.log(ooxml.value)
        let str=String(ooxml.value)
        let replacedXml =ooxml.value
        // paragraphs.items[0].insertOoxml(replacedXml,Word.InsertLocation.replace)
        // context.document.body.insertOoxml(replacedXml, Word.InsertLocation.replace);
        var range = context.document.getSelection()
        range.insertOoxml(replacedXml,"Replace")
        // console.log(replacedXml)
      });      
    
    });