With GCloud CLI -- how to list all instances associated with a particular schedule (i.e. resource-policy)? [migrated]

Here is a picture of the WebUI for GCP, showing an "instance schedule" that has 3 instances currently associated with it:

How can I list those same 3 instances using the GCloud CLI?

I found commands to add a VM to a schedule:

gcloud compute instances add-resource-policies ...

I found commands to remove a VM from a schedule:

gcloud compute instances remove-resource-policies ...

I tried "viewing" the schedule:

gcloud compute resource-policies describe ...

Or even the metadata you get with JSON format:

gcloud compute resource-policies list --format=json ...

So that is my question -- how to get that list of associated VM's given a particular schedule, or resource-policy.

Thanks in advance :)