roFont is in the Brightscript manual, where pretty much all the new features are.
Maybe there is a smaller font you can find? If not, then you can use roURLTransfer gettofile() or asyncGettoFile() to download to tmp:/ but 6mb is a significant bandwidth hit if you have lots of users (although, nothing near the bandwidth cost of streaming video).
A quick google search for Chinese fonts file size comes up with quite a variety of fonts.
- Joel