I've done quite a bit with Chinese in Construct.
Are you going to use a sprite font? Because that's the only text type object that supports custom widths for each character like a space with "0" width. If you do, your font is going to be HUGE unless you're implementing a very limited subset of Chinese/Japanese.
Yep! Someone helped me out translating my game to chinese, and they also made a list of all the characters used, so it's fine though. Here's a picture of what the sprite font looks like if you're curious:
Thankfully my game isn't text-heavy, so it's fine. The solution I mentioned worked just fine, it was a bit annoying to space out all the characters in the game text but it's working out great!