Custom Tags: Regex or List Support

We are attempting to properly scope our inventory list for GCP using the configuration shown below:

However, for the purposes of scoping we actually have two values for the environment label that are in scope (environment=prod and environment=common). It would be very helpful to be able to use a regex or a comma separated list instead of a string literal. We cannot easily invert this  and use "when equal to", because we also have multiple non prod environments. It seems our only option right now is not add a new label to many of our resources.