Can Amazon Sumerian be intergated with Google Dialogflow chatbot or IBM Watson chatbot ? If yes, how ?

Amazon Sumerian is no longer accepting new customers. We recommend taking a look at the Amazon Sumerian Hosts open source project which has integrations with Babylon.js and Three.js engines. Hosts provides integrations with Amazon Lex and Amazon Polly and you can take a look at those integrations as a a reference implementation for other machine learning services.