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Ok I found my answer after digging through some old issues in GRPC-Gateway Github. This issue called out a similar situation to mine. Once it was added it pointed to the correct spot in the documentation: https://github.com/grpc-ecosystem/grpc-gateway/issues/707

https://cloud.google.com/service-infrastructure/docs/service-management/reference/rpc/google.api#httprule

Under special notes https://cloud.google.com/service-infrastructure/docs/service-management/reference/rpc/google.api#special-notes I found the field for responseBody

In my RPC definition, I was able to add a responseBody field which pulls out my array to the top level JSON:

option (google.api.http) = {
      get: "/test/v1/test"
      response_body: "example"
    };

This then left me with the JSON I needed.

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