title: Angular6 Schema Form Dynamic Select
body: <p>I'm using <a href="https://www.npmjs.com/package/angular6-json-schema-form" rel="nofollow noreferrer">Angular6 JSON Schema Form</a></p>
  
  <p>Where an html select element is described with json as below:</p>
  
  <pre><code>  {
  "schema": {
    "type": "object",
    "title": "My Form",
    "properties": {
      "select1552420741389": {
        "type": "string"
      }
    },
    "required": [
      "select1552420741389"
    ]
  },
  "layout": [
    {
      "key": "select1552420741389",
      "type": "select",
      "multiple": false,
      "notitle": false,
      "title": "Select",
      "titleMap": [
        {
          "name": "Option 1",
          "value": "option1"
        },
        {
          "name": "Option 2",
          "value": "option2"
        }
      ]
    }
  ],
  "data": {}
  }
  </code></pre>
  
  <p>And I would like to have the option to dynamically load the titleMap via a custom callback function or specify a URL to call to get the titleMap data.</p>
  
  <p>I've seen drop in libraries written in angular.js but I need a solution that works for Angular and Material.</p>
  
  <p>Any suggestions much appreciated!</p>