How to add custom Block at Shipping Method Select in Magento 1

I want to add custom block below shipping methods and this custom block should be inside of shipping method form. I think following line of code is helpful for adding this. but no idea how to proceed.

<div id="onepage-checkout-shipping-method-additional-load">
    <!-- ko foreach: getRegion('shippingAdditional') -->
    <!-- ko template: getTemplate() --><!-- /ko -->
    <!-- /ko -->
</div>

Referring how-to-add-custom-block-at-shipping-methods-below-in-onepage-checkout but I need it in Magento 1