Display data in loop on main page

Hello!
How to display data field in loop?

I use

global $wc_cpdf;
echo "Field name: " .$wc_cpdf->get_value(get_the_ID(), '_myreg');

but it shows only field name
Please help
https://ww.wp.xz.cn/plugins/woocommerce-custom-product-data-fields/