I read a couple of articles on this and it doesn't appear that you can watch any Regional Network that is out of your area. The Regional Sports Network package is already an additional addon, and only gives access to your local area. This is how I'm interpreting what I'm reading, anyway.
https://support.fubo.tv/hc/en-us/articles/115005322088-What-Regional-Sports-Networks-are-available-on-Fubo?
https://support.fubo.tv/hc/en-us/articles/360046050051-What-is-the-Regional-Sports-Fee