I need post codes as the default for shipping

I am setting up shipping for our webshop and the default option is to include regions for Norway. Unfortunately, our last mile delivery company specifies by post codes and not regions. So I need to be able to upload specific post codes and not check off regions.

It is not possible to use the local delivery option instead because I would have to include around 100 options here.

Attached is a picture of where I need the option for post codes.