With Italian, it starts reading the text with an absolutely comical American accent, but then about 10-20 words in it gradually snaps into a natural Italian pronunciation and it sounds fantastic from that point on. Not sure what's going on behind the scenes, but it sounds like it starts with an en-us baseline and then somehow zones in on the one you specified. Using Alice.
For Portuguese, interestingly enough one of the voices (Liam) has a Spanish accent. Also, the language flag is from Portugal, but the style is clearly Brazilian Portuguese.