Magento2: Config data save using Custom Module

Question

I want to save encrypted value in core_config_data while setup upgrade without using config.xml. I am trying to use data patch file

Vendor\Credentials\Setup\Patch\Data\AddData.php

use Magento\Framework\Setup\Patch\DataPatchInterface;
use Magento\Framework\Setup\Patch\PatchVersionInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\App\Config\Storage\WriterInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Config\Model\Config\Backend\Encrypted;
use Magento\Framework\Encryption\EncryptorInterface;


public function __construct(
        ModuleDataSetupInterface $moduleDataSetup,
        EncryptorInterface $_encryptor,
        WriterInterface $configWriter
    )
    {
        $this->moduleDataSetup=$moduleDataSetup;
        $this->_encryptor = $_encryptor;
        $this->configWriter = $configWriter;
    }



$this->moduleDataSetup->startSetup();
        $privateKey = $encrypted = $this->_encryptor->encrypt($value);
        $publicKey = $encrypted = $this->_encryptor->encrypt($value);
        $this->configWriter->save(self::XML_PATH_PRIVATE_API_KEY, $privateKey, $scope = ScopeConfigInterface::SCOPE_TYPE_DEFAULT, $scopeId = 0);
        $this->configWriter->save(self::XML_PATH_ENABLED, 1, $scope = ScopeConfigInterface::SCOPE_TYPE_DEFAULT, $scopeId = 0);
        $this->moduleDataSetup->endSetup();

But entry is not saving. I have checked patch table entry and here patch get register.