Bug in Export Plugin Add on

Hi,

In the WooCommerce Product Export [V 1.0] Add on, role based prices don’t get exported when all columns are selected. However, they get exported when only Role Based Pricing columns are selected in the default export page.

Also, I want to export/import rbp without using the add ons. I am using the custom import/export fields function given here- https://github.com/woocommerce/woocommerce/wiki/Product-CSV-Importer-&-Exporter#adding-custom-import-columns-developers

What should I put in the columns names? I tried putting _role_based_price but that doesn’t work in export/import.