8 – How to create a form render element for a paragraphs field?

I have the following EntityForm and I want to add a entity_reference_revisions field for the paragraph entity with the allowed bundle type orga_structure.

I searched the web but haven’t found a hint to resolve this.

$form(‘target’) is the element I tried, but it isn’t rendered.

class AbsenceConfigForm extends EntityForm {

  public function form(array $form, FormStateInterface $form_state) {
    $form = parent::form($form, $form_state);

    $absence_config = $this->entity;
    $form('label') = (
      '#type' => 'textfield',
      '#title' => $this->t('Label'),
      '#maxlength' => 255,
      '#default_value' => $absence_config->label(),
      '#description' => $this->t("Label for the Absence config."),
      '#required' => TRUE,
    );

    $form('id') = (
      '#type' => 'machine_name',
      '#default_value' => $absence_config->id(),
      '#machine_name' => (
        'exists' => 'Drupalks_absenceEntityAbsenceConfig::load',
      ),
      '#disabled' => !$absence_config->isNew(),
    );

    /* You will need additional form elements for your custom properties. */
    
    $form('target') = (
      '#type' => 'entity_reference_revisions',
      '#handler' => 'default:paragraph',
      '#handler_settings' => (
        'target_type' => (
          'orga_structure',
        ),
      ),
    );

    // $form('target') = BaseFieldDefinition::create('entity_reference_revisions')
    //   ->setLabel(t('Skill'))
    //   ->setDescription(t('The ID of the skill'))
    //   ->setRevisionable(TRUE)
    //   ->setSetting('handler', 'default:paragraph')
    //   ->setSetting('handler_settings', ('target_bundles' => ('orga_structure' => 'orga_structure')))
    //   ->setSetting('handler_settings', ('negate' => 0))
    //   ->setTranslatable(TRUE)
    //   ->setDisplayOptions('form', (
    //     'type' => 'entity_reference_autocomplete',
    //     'weight' => 5,
    //     'settings' => (
    //       'match_operator' => 'CONTAINS',
    //       'size' => '60',
    //       'autocomplete_type' => 'tags',
    //       'placeholder' => '',
    //     ),
    //   ))
    //   ->setDisplayConfigurable('form', TRUE);
    
    return $form;
  }

  public function save(array $form, FormStateInterface $form_state) {
    $absence_config = $this->entity;
    $status = $absence_config->save();

    switch ($status) {
      case SAVED_NEW:
        $this->messenger()->addMessage($this->t('Created the %label Absence config.', (
          '%label' => $absence_config->label(),
        )));
        break;

      default:
        $this->messenger()->addMessage($this->t('Saved the %label Absence config.', (
          '%label' => $absence_config->label(),
        )));
    }
    $form_state->setRedirectUrl($absence_config->toUrl('collection'));
  }

}