scroller_theme.php

<?php

/**
 * @file
 * Theme for My Scroller views.
 */

/**
 * Prepares variables for views scroller templates.
 *
 * Default template: views-view-scroller.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: A ViewExecutable object.
 *   - rows: The raw row data.
 */
function template_preprocess_views_view_scroller(&$variables) {
  // View options set by user.
  $options = $variables['view']->style_plugin->options;
  $rows = $variables['rows'];
  // Apply required logic and add variables here. We can define variable in
  // our hook_theme and use it here.
}