Needs to Access Kubernetes default ETCD

I am trying to create API-Extension-Server with Git Link . There used new ETCD for data management,

      serviceAccountName: apiserver
      - name: wardle-server
        # build from staging/src/
        # or
        # docker pull
        # docker tag kube-sample-apiserver:latest
        image: kube-sample-apiserver:latest
        imagePullPolicy: Never
        args: [ "--etcd-servers=http://localhost:2379" ]
      - name: etcd

but i want to access/use Kubernetes default ETCD for managing the data. Is this Possible?

If Yes. Kindly share the suggestion/reference.