<?php

namespace Kai\Product\Block;

use Magento\Framework\Registry;
use Magento\Framework\View\Element\Template;

class Custom extends Template
{
    protected $registry;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        Registry $registry,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->registry = $registry;
    }

    public function getCustomAttribute()
    {
        $product = $this->registry->registry('current_product');
        // Replace 'your_custom_attribute_code' with your actual attribute code
        return $product->getData('kai_attribute');
    }
}