Create database connection in app server

Hello, is it possible to create connections to databases directly here:

The goal is to be able to query various databases depending on the client and to process data dynamically

thanks

Morgan

No one will know how to do it?

It's not supported, though I'm sure someone managed to do something similar in NodeJS using environment variables or some sort... Like dynamically setting an environment variable

Can't you use a single database and separate data by "tenant_id"?