Changing spoken language in Halo Wars 2

Although I appreciate the fact Halo Wars 2 is voiced over in my language I would much rather listen to the orignal audio its portuguese version, from what I can tell there’s no option to switch the spoken language to english, I’ve had the same problem with Halo MCC and 5 on the Xbox One, but in that platform I could simply switch my Xbox’s region to an english speaking country, there seems to be no way of doing so in Windows 10.
So how exactly do I change the spoken language?