I can't see any option to do that. And with a 200-300 ping, there is absolutely no way the server is anywhere in Asia. It might say that, but it will just be what it says. The actual physical location of the server I can almost guarantee is in the US. If it was Europe the ping would be ~150. If it was *actually* in Asia it would be sub-100, and probably sub-50.
Path of Exile has a Singapore server, and I have a 7ms ping in that game. The Australian server gives ~50ms.
I definitely think there is an Asian server as I am currently over that way and all I get in my groups are Chinese players. Oddly enough every single group I get in someone leaves their mic open and I get to hear a lot of singing. Sometimes via the radio and sometimes via the player singing along with the radio.
Settings > Gameplay > Show Connectivity Info
Then for me it shows I am connected to a server in Asia, and then give me a ping indication, usually mostly red. Sometimes I get a yellow, and one time I had a blue status.
Yes I fully agree, the ping playing from Asia is absolute crap. I also opened a thread asking for help how to find out where the servers actually are, but no success so far.