Google-Recommended Solution for Private Network Data Transfer from Azure to GCP Buckets

[Nikp]

What is the Google-recommended product for continuous data transfer (batch/real-time) from an Azure bucket to a GCP bucket? While STS is a common solution, it uses public routes over HTTPS. Is there a recommended approach for transferring data over a private network once connectivity (Express Route + Interconnect) between Azure and GCP is established? Specifically, I’m looking for a solution that can operate entirely over a private network, given that STS cannot use private networks for such transfers due to its reliance on publicly resolvable endpoints.