Inject file.usage service to custom service

use Drupal\file\FileUsage\DatabaseFileUsageBackend;

 /**
 * File usage service.
 */
protected DatabaseFileUsageBackend $fileUsage;

/**
 * Constructs an object.
 *
 * @param \Drupal\file\FileUsage\DatabaseFileUsageBackend $file_usage
 *   File usage service.
 */
public function __construct(DatabaseFileUsageBackend $file_usage) {
 $this->fileUsage = $file_usage;
}

*.services.yml

services:
 custom.service:
   class: Drupal\my_module\MyService
   arguments: ['@file.usage']