Thank you @akelad for your response. I have followed the jieba_tokenizer, and I just eliminated some parts which I consider it not exist in Mecab, example Dictionary.
I finally got this Custom Component (Mecab) along with this configuration config.yaml.
I rantraining data as normal, I got it successful trained, and I tried to do prediction but It seem that to be false. All the prediction is return as “None”.
I think there is some problem with Text Tranformation, but cannot fix it out yet.
I link complete code, here, maybe you could try it out. I think I tokenization is the problem but I already try my best.
Hope to fix it out here, I really want RASA to work with Japanese Text
Thank you