need help to creating chatbot in Amazon chime

[NeethithevanR]

I have used Bot framework composer (Version: 2.1.2) dotnet to build my bot. I have implemented chatbot in few channels(Teams, Skype, Slack, Webex, etc). Now I want to implement a chatbot in Amazon Chime channel. As per the documentation I read, we can implement Amazon chime chatbot using a direct line branding (https://learn.microsoft.com/en-us/azure/bot-service/bot-service-channel-directline).

1. Is it the only possible way to create Amazon chime chatbot? 
2. Is there any other alternative available to implement the Amazon chime chatbot? (Please share me the documentation link.)

Important Note: I don't use the Azure Bot Service to deploy my bot in Azure. I deploy and run my bot in my host as a dotnet service