特定のformに動的にJavaScriptをロードする方法

function MODULE_form_FORMID_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  $form['any'] = [
    '#type' => 'html_tag',
    '#tag' => 'script',
    '#attributes' => [
      'src' => "JAVASCRIPT's source",
    ],
  ];
}