Is there a way to run a PostgreSQL Database on a OnPremise Server that is used in a SAP CAP app running in SAP BTP Cloud Foundry?

In this old ticket: someone had the same requirement, but I miss details about the setup.

My current status is:

• SAP CAP runs localy against PostgreSQL
• Cloud Connector is connected to BTP
• I created a Destination to the virutal host

Anyhow not sure hwo to configure mta.yaml / package.json and potentially .cdsrc.json to get the system connect.

Meanwhile I am also in doupt that it is possible to do so?