usesRowPlugin example

'value' => $style_title,
      'setting' => $style_summary,
      'desc' => $this->t('Change the way content is formatted.'),
    ];

    // This adds a 'Settings' link to the style_options setting if the style has     // options.     if ($style_plugin_instance->usesOptions()) {
      $options['style']['links']['style_options'] = $this->t('Change settings for this format');
    }

    if ($style_plugin_instance->usesRowPlugin()) {
      $row_plugin_instance = $this->getPlugin('row');
      $row_summary = empty($row_plugin_instance->definition['title']) ? $this->t('Missing row plugin') : $row_plugin_instance->summaryTitle();
      $row_title = empty($row_plugin_instance->definition['title']) ? $this->t('Missing row plugin') : $row_plugin_instance->pluginTitle();

      $options['row'] = [
        'category' => 'format',
        'title' => $this->t('Show'),
        'value' => $row_title,
        'setting' => $row_summary,
        'desc' => $this->t('Change the way each row in the view is styled.'),
      ];
      

  protected function buildFormStyle(array &$form, FormStateInterface $form_state, $type) {
    $style_form = &$form['displays'][$type]['options']['style'];
    $style = $style_form['style_plugin']['#default_value'];
    $style_plugin = Views::pluginManager('style')->createInstance($style);
    if (isset($style_plugin) && $style_plugin->usesRowPlugin()) {
      $options = $this->rowStyleOptions();
      $style_form['row_plugin'] = [
        '#type' => 'select',
        '#title' => $this->t('of'),
        '#options' => $options,
        '#access' => count($options) > 1,
      ];
      // For the block display, the default value should be "titles (linked)",       // if it's available (since that's the most common use case).       $block_with_linked_titles_available = ($type == 'block' && isset($options['titles_linked']));
      $default_value = $block_with_linked_titles_available ? 'titles_linked' : key($options);
      

public array $render_tokens = [];

  /** * Overrides \Drupal\views\Plugin\views\PluginBase::init(). * * The style options might come externally as the style can be sourced from at * least two locations. If it's not included, look on the display. */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);

    if ($this->usesRowPlugin() && $display->getOption('row')) {
      $this->view->rowPlugin = $display->getPlugin('row');
    }

    $this->options += [
      'grouping' => [],
    ];

  }

  /** * {@inheritdoc} */

  public function getOutput() {
    return $this->output;
  }

  /** * {@inheritdoc} */
  public function render() {
    $output = '';
    if (!$this->usesRowPlugin()) {
      $output = $this->getOutput();
    }
    else {
      foreach ($this->view->result as $index => $row) {
        $this->view->row_index = $index;
        $output .= $this->view->rowPlugin->render($row) . "\n";
      }
    }

    return $output;
  }