How we can call multiple blocks in a single controller?

Is there a way to call multiple blocks in a single controller in Magento 2?
The below code only populate the single grid but I want it to return two blocks.

public function execute()
    {
        /* @var MagentoFrameworkControllerResultRaw $resultRaw /
        $resultRaw = $this->_resultRawFactory->create();
        return $resultRaw->setContents(
            $this->_layoutFactory->create()->createBlock(
                VendorModuleNameBlockAdminhtmlReportGrid::class,
                'mytestgrid'
            )->toHtml()
        );
    }