Extra Checkout Options requires WooCommerce Extra Product Options 5x to work. It allows you to use the form builder in WooCommerce Extra Product Options to create extra fields on your WooCommerce checkout page which can be free or paid.

Demo: https://codecanyon.net/item/extra-checkout-options-addon-for-extra-product-options/20439659

WooCommerce product addons – Ultimate product options plugin allows store owners to create unlimited product options & assign the options to the products, the plugin supports up to 16 addon fields to create the options.

Demo: https://codecanyon.net/item/woocommerce-product-addons-ultimate-product-options-plugin/27099033