private function _getValueRenderer()
    {
        if (!$this->getValueRenderer) {
            $this->getValueRenderer = $this->getLayout()
                ->createBlock(
                    \Dotdigitalgroup\Email\Block\Adminhtml\Config\Select::class,
                    '',
                    ['data' => ['is_render_to_js_template' => true]]
                );
        }

        return $this->getValueRenderer;
    }