I have created a chat bot in aws Lex and wanted to integrate with a webpage. In the Lex console, only Facebook/Twillio/Slack are available, but I have to integrate this with my webpage.
Have you checked Greetings, visitor!” — Engage Your Web Users with Amazon Lex page?
They have documented pretty much everything and also provided a basic code. Try to play with the code and see if you can accomplish what you want.
If not, come back here and post your doubts.
In this page they have shown how to capture voice inputs as well.
All the best.