Handling react.js chat application in omnichannel chat bot

Question

As i am expecting to handle all chats and files in omnichannel from react.js web application.

Here i am not aware how to handle web page message conversation in to omnichannel

I found some reference following by

https://learn.microsoft.com/en-us/dynamics365/customer-service/developer/omnichannel-api-reference

But it execute with in omnichannel not from external web application. I need some reference to handling web chat conversation