If you want to add country-specific checkout fields for Brazil, you need to install a third party plugin WooCommerce Extra Checkout Fields for Brazil By Claudio Sanches. You can download it from here.
After installing and configuring the plugin, extra Shipping and Billing fields will get added to the Checkout form.
The following fields will be available:
- Person Type
- Cell Phone
Few Settings to make this functional
1. Keep the Billing Address first before the Shipping address
2. Keep Company field *optional* in WooCommerce Customize settings
Setting available at Dashboard > Appearance > Customize > WooCommmerce > Checkout
3. Keep Company field *Visible* in Checkout billing fields