ValueProcessor.php

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<?php
namespace Magento\Theme\Model\Design\Config;

use Magento\Theme\Model\Design\BackendModelFactory;

class ValueProcessor
{
    protected $backendModelFactory;

    public function __construct(
        BackendModelFactory $backendModelFactory
    ) {
        $this->backendModelFactory = $backendModelFactory;
    }

    public function process($value, $scope, $scopeId, array $fieldConfig)
    {
        $backendModel = $this->backendModelFactory->createByPath(
            $fieldConfig['path'],
            [
                'value' => $value,
                'field_config' => $fieldConfig,
                'scope' => $scope,
                'scope_id' => $scopeId
            ]
        );
        $backendModel->afterLoad();
        return $backendModel->getValue();
    }
}