Souke/domain/Setting/SettingDetails/Producer/ProducerSettingDefinition.php

<?php

namespace domain\Setting\SettingDetails\Producer;

use domain\Setting\SettingDefinition;

class ProducerSettingDefinition extends SettingDefinition
{
    const SECTION_GENERAL = 'general';
    const SUBSECTION_GENERAL = 'general.main';

    public function getSettings(): array
    {
        return [
            self::SECTION_GENERAL => [
                self::SUBSECTION_GENERAL => [
                    // ...
                ]
            ]
        ];
    }

    public function getSectionLabels(): array
    {
        return [
            self::SECTION_GENERAL => 'General',
            self::SUBSECTION_GENERAL => 'General',
        ];
    }
}