How to change the var initialState parameter?

Question

css

Please help, there is a div with id <div id="map"></div>and a script for this id:

Connected script:

<script src=https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-directions/v4.0.2/mapbox-gl-directions.js></script>

var initialState = {
  // Options set on initialization
  api: 'https://api.mapbox.com/directions/v5/',
  profile: 'mapbox/driving-traffic',
  alternatives: false,
  congestion: false,
  unit: 'imperial',
  flyTo: true,
  placeholderOrigin: '123',
  placeholderDestination: 'Choose destination',
  zoom: 16,
  language: 'en',
  compile: null,
  proximity: false,
  styles: [],

How to change placeholderDestination: 'Choose destination' to placeholderDestination: 'last,

Answer 1

Change hands) And what actually does not work?