public function toOptionArray()
    {
        $fields = $this->dataHelper->getOrderTableDescription();

        $customFields[] = [
            'label' => __('---- Default Option ----'),
            'value' => '0',
        ];
        foreach ($fields as $field) {
            $customFields[] = [
                'value' => $field['COLUMN_NAME'],
                'label' => $field['COLUMN_NAME'],
            ];
        }

        return $customFields;
    }