How to use Lex Automated Chatbot Designer in an API call?

We have tried the amazing Lex new feature - Automated Chatbot Designer from Lex console using our transcript dataset. How do we use this Lex Automated Chatbot Designer from an API call? I could not find any documentation on using this new feature from API. Could you provide an example on how to create a Lex bot from transcripts on an S3 bucket?