Add Integration Cloud in the backend service

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Hi Experts,

I have the independent instance of VBCS without having the Integration Cloud. I want to add the Integration Cloud as one of the backend servers.

When I modify the existing Integration Cloud backend connection in the VBCS settings section, I have provided the destination Integration URL and in the Authentication, I only see three options. 

The IDCS of VBCS and Integration Cloud is totally different. I want to use Basic Auth while adding the Integration Cloud connection in the VBCS instance and it is not possible can you guide to how to create the connection successfully.

Can someone guide how to do this.