Magento 2 Module to add a comment field above the place order button in the checkout
Setup
composer require ecomteck/magento2-order-comments
Questions & Anwsers:
Q: How to Ecomteck One Step Checkout show comments in the order confirmation email?
A: Go to admin to create new transactional email template.
On the email template content area add the variable shortcode as this:
{{var order.getEcomteckOrderComment()}}