Hybrid mode deployment in on-prem

Hello everyone,
I was successfully able to install kong as a hybrid mode in two different gcp clusters one as DP and another as CP.
If I were to install a Dataplane in on-prem/local/vm instance privately [not in cloud / private clusters] , but my CP node is hosted in a private cluster in cloud,…

How do i access services running in my on-prem , say some DP cluster B wants to query some information from my on-prem DP that hosts a database.

How can i access microservices running in DP -on-prem from outside securely that is configured to centralized CP.

Even if i configure services/routes in CP , how can database calls to DP-on-prem be made from another cluster ??

Is this configuration possible with KONG Gateway hybrid deployments.