Have you tried the Quick Connect to GCP feature for Equinix Fabric?

Quick Connect to Google Cloud Platform (GCP) is a new Equinix Fabric feature that enhances the creation of L2 connections to GCP. Instead of logging into the GCP portal to create a Google service key, all of the required provisioning steps can be performed from within the Equinix Fabric portal. Prerequisites and detailed instructions can be found in the following on-line resources.