Implementing Service Orchestration on Kong

How would you go about implementing Service Orchestration on Kong ?
Service A - a main service which call multiple other downstream services and merges the results & returns a response or a variant where Service A calls Service B to get some reference data, and then calls Service C and returns a response.
On other platforms there are built in capabilities, which allow a service callout in a proxy.
This doesn’t seem to be a built in feature in Kong , and seems to require writing a plugin to accomplish.

Thanks

Mehedi

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