Proper way for autoloading in Joomla 4

I’m trying to make my news module modification working with Joomla 4. My module is calling custom fields and I use this autoloader below to make it work in Joomla 4. Can you tell me what is the proper way to use autoloader on Joomla 4 instead of using this legacy one?

JLoader::register('FieldsHelper', JPATH_ADMINISTRATOR . '/components/com_fields/helpers/fields.php');

use JoomlaComponentFieldsAdministratorHelperFieldsHelper;