Results

          $this->row_tokens[$count] = $handler->get_render_tokens(array());
        }
      }
      unset($this->view->row_index);
    }

    return $this->rendered_fields;

<div class="slider-pro" id="{{id}}">	
	<div class="sp-slides">{{ rows }}</div>
	{% if rows.0['#view'].style_plugin.render_tokens.0['{{ drupal_slider_thumbnails }}']|render|striptags is not empty %}
		<div class="sp-thumbnails">
			{% for row in rows %}
			{% set img = row['#view'].style_plugin.render_tokens[ loop.index0 ]['{{ drupal_slider_thumbnails }}']|render|striptags %}
				<img class="sp-thumbnail" src="{{ img }}"/>
			{% endfor %}
		</div>	
	{% endif %}
</div>

 * Implements hook_tokens().
 */
function token_entity_render_tokens($type, array $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) {
  $replacements = [];
  $to_process = [];

  if (!isset($data['entity_type'])) {
    // Don't do anything if not processing an entity.
    return $replacements;

      // Use isset() because empty() will trigger on 0 and 0 is
      // the first row.
      if (isset($row_index) && isset($this->view->style_plugin->render_tokens[$row_index])) {
        $tokens = $this->view->style_plugin->render_tokens[$row_index];
      }
      elseif (!empty($tokens = $this->getRenderTokens($value))) {
        // We defined $tokens in the if statement.
      }
      else {
        // Get tokens from the last field.

   * Get token replacements.
   *
   * With code from @see \views_handler_field::get_render_tokens()
   */
  function getTokenReplacements($ui = FALSE) {

    $our_filter_wrapper = $this->getFilterWrapper();
    $evi = $our_filter_wrapper->getEvi();
    $display_handler = $evi->displayHandler;