Is there any way of accessing the first item inside a processor or an extension? about core HOT 2 CLOSED

final class CSVExporter implements ItemProcessorInterface
{
    use Configurable;

    private int $itemsProcessed = 0;

    public function processItem(ItemInterface $item): ItemInterface
    {
        if ($this->itemsProcessed === 0) {
            $this->createCSVFile();
        }

        $this->addRowToCSVFile($item);

        $this->itemsProcessed++;
    }

    private function createCSVFile(): void
    {
        // Create file with headers...
    }

    private function addRowToCSVFile(ItemInterface $item): void
    {
        // Add row to file...
    }
}