Extend image editing settings in the Wordpress Editor

extend-wordpress-image-settings.js

(function ($, _) {
  var media = wp.media;

  var sizes = [
    '100%'
  ];

  media.events.on('editor:image-edit', function (data) {
    var origImageDetails = media.view.ImageDetails;
    media.view.ImageDetails = origImageDetails.extend({
      initialize: function () {
        origImageDetails.prototype.initialize.apply(this, arguments);
        this.on('post-render', this.addSizeClass);
        this.initSize = this.model.get('size');
      },

      addSizeClass: function () {

        sizes.forEach((size) => {
          var sizeTitle = size.charAt(0).toUpperCase() + size.slice(1);
          var select = this.$('.embed-media-settings select.size');
          var hasSize = select.find('[value="' + size + '"]').length;

          if (!hasSize) {
            var $opt = $(document.createElement('option')).attr('value', size).text(sizeTitle);

            if (this.initSize == size) $opt.attr('selected', 'selected');

            select.append($opt);
          }

        });
      }

    });
  });

}(jQuery, _));

functions.php

<?php
function admin_scripts($hook){
  if($hook == 'post.php'){
      wp_enqueue_script( 'admin-scripts', get_template_directory_uri() . '/path/to/admin-scripts.js', array(), '1.0', true );
  }
}

add_action('admin_enqueue_scripts', 'admin_scripts');