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I need to vary the deployment config of an application, by adding an extra YAML section within it (in the example the section name: ping and its two attributes)
containers:
- name: openshift-wf-cluster
image: 172.30.1.1:5000/demo/openshift-wf#sha256:5d7e13e981f25b8933d54c8716d169fadf1c4b9c03468a5b6a7170492d5b9d93
ports:
- containerPort: 8080
protocol: TCP
- name: ping
containerPort: 8888
protocol: TCP
Is it possible to do it from the oc shell command ?(without manually editing the file) A sort of adding an extra node to one section of the YAML ?

Yes.
oc edit dc/deployment-1-name