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    protected $_scopeConfig;
 
    public function __construct(
    \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig) {
            $this->_scopeConfig = $scopeConfig;
    }
    
    $storeScope = \Magento\Store\Model\ScopeInterface::SCOPE_STORES;
    $this->_scopeConfig->getValue("section_id/group_id/field_id", $storeScope);

section_id, group_id, field_id values you can find in etc/adminhtml/system.xml path in your custom / (default vendor) Module