How to track services that are not available in an environment. Can we create a dummy time series with label and value 0

We can keep track of pods which are running in our env but how to keep track of services which are not supported. Example we don’t support list of application like appA,appB,appC in an env, trying to list kube_pod_labels for these app will result in No data. we can display 0 vector instead of No data but still we don’t know for which 0 is associated with.

our goal is to create something like this

appA not-configured
appB. not-configured
appC not-configured
appD Running
appE Running

Any idea or approach to do this ?