Need Small Changes In WooCommerce Analytics Generate Report

We have a WooCommerce installation where we need to add some additional fields to the product’s export.

Features needed
– Should work as it is now with the following changes
– Should add a new total column below everything as the last row summing all numeric rows
– Filename should be suggested as “.xlsx” instead of “.csv” (actual file format could be CSV, but the client will be able to automatically open in Excel by naming it “.xlsx”)
– Button in the attached screenshot should be replaced or a new button should be added next to it
– Export should still respect the selected date range

Additional information
– Changes should be made so that WordPress and all plugins can be upgraded without breaking the changes
– Changes may not modify any core files
– Site is running on our server, we can give you FTP or cPanel access
– Site is not yet live

If you have any questions, please ask before bidding.