Hello,
Based on the question provided; It would seem that the feature of getting log storage summary via gCloud CLI is currently not possible in GCP. However, I would recommend filling a feature request on Issue Tracker in order to have the Cloud Logging team verify if this feature could be added in the near future.
In addition, I would recommend reviewing the following resources in the meantime below in order to learn more about how you can better manage logging storage on GCP:
1. Usage logs & storage logs:
https://cloud.google.com/storage/docs/access-logs
2. Use the Logs Dashboard:
https://cloud.google.com/logging/docs/view/dashboard
3. Monitor your logs:
https://cloud.google.com/logging/docs/alerting/monitoring-logs
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