Yes. You can create text layers in Japanese using Cloudinary's image transformations.
For example, the following Ruby command was run in order to create a text style named jp_takao based on the TakaoExGothic font:
Cloudinary::Uploader.text("JP Takao Sample", :font_family => "TakaoExGothic", :font_size => 28, :font_color => "#222222", :public_id => "jp_takao")
Now this style can be used for generating a text layer in Japanese. For example:
The following font families are currently available: TakaoExGothic, TakaoExMincho, TakaoGothic, TakaoMincho, TakaoPGothic, TakaoPMincho.