Custom extension for Magento 2 Checkout

I need an extension that 1. adds a field below the shipping address region during checkout as below: CHOOSE PACKAGE OPTION -> Title Dropdown with two options ("Gift Packing", "Normal Package") Choosing one of the options above is mandatory for proceeding to payment. There is NO difference in price for either option. The selected option needs to be saved to Order. 2. In the admin panel, when an user exports the orders, this option should be included in the downloaded CSV. 3. In addition to the existing fields in the Order CSV, I need the list of products ordered also to be included in one column, separated by line breaks.