Paste this into the Google App Script Editor

gistfile1.js

// Get UI Context
var ui = DocumentApp.getUi();

function onOpen(){
 ui.createMenu('Stocks').addItem('Add Stock Info', 'addStockInfo_').addToUi();
}

// Handle Menu Item
function addStockInfo_(){
  // Prompt user and get result
  var result = ui.prompt('Enter Ticker Symbol');
  
  // Get stock info based on result
  var stockInfo = FinanceApp.getStockInfo(result.getResponseText());
  
  // Prepare table of data
  var data = [
    ['Stock', stockInfo.name],
    ['Price', stockInfo.price],
    ['Volume', stockInfo.volume]
  ]
  var body = DocumentApp.getActiveDocument().getBody();
  var table = body.appendTable(data);
  
  // Bold the first column of the table
  for(var i=0; i < data.length; i++) {
    table.getRow(i).getCell(0).editAsText().setBold(true);
  }
}