How to attach field type to a textfield form ?

Hi everyone
I'm trying to attach a textfield widget on (https://www.drupal.org/project/google_place_autocomplete) on my textfield in my buildForm but no way how to do this. I'm trying to add autocomplete for google place in this field but I can't find a way to set the formatter to the field. Is there a way to get widget on form?

Here is my form :

/**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form['activity_name'] = array(
      '#type' => 'textfield',
      '#title' => t('Quelle activité?'),
      '#required' => true,
    );
    $form['location_address'] = array(
      '#type' => 'textfield',
          '#title' => t('Where'),
      '#required' => TRUE,
    );
    $form['actions']['#type'] = 'actions';
    $form['actions']['submit'] = array(
      '#type' => 'submit',
      '#value' => $this->t('OK'),
      '#button_type' => 'primary',
    );

    $form['actions']['localiser'] = array(
      '#type' => 'button',
      '#value' => $this->t('Localiser'),
//      '#button_type' => 'primary',
    );
    return $form;
  }

Here is the widget property

/**
 * Plugin implementation of the 'field_example_text' widget.
 *
 * @FieldWidget(
 *   id = "google_place_autocomplete",
 *   module = "google_place_autocomplete",
 *   label = @Translation("Place Autocomplete"),
 *   field_types = {
 *     "string"
 *   }
 * )
 */

/**
 * Plugin implementation of the 'google_place_map' formatter.
 *
 * @FieldFormatter(
 *   id = "google_place_map",
 *   module = "google_place_autocomplete",
 *   label = @Translation("Google Map"),
 *   field_types = {
 *     "string"
 *   }
 * )
 */

If you have any idea please let me know Thanks you a lot in advance,