ListField.php

<?php

namespace Drupal\options\Plugin\views\filter;

use Drupal\views\Attribute\ViewsFilter;
use Drupal\views\FieldAPIHandlerTrait;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\views\Plugin\views\filter\ManyToOne;
use Drupal\views\ViewExecutable;

/**
 * Filter handler which uses list-fields as options.
 *
 * @ingroup views_filter_handlers
 */
class ListField extends ManyToOne {
    use FieldAPIHandlerTrait;
    
    /**
     * {@inheritdoc}
     */
    public function init(ViewExecutable $view, DisplayPluginBase $display, ?array &$options = NULL) {
        parent::init($view, $display, $options);
        $field_storage = $this->getFieldStorageDefinition();
        // Set valueOptions here so getValueOptions() will just return it.
        $this->valueOptions = options_allowed_values($field_storage);
    }

}