Im working on cognos dashboard embedded using the reference from - Cognos Dashboard embedded.
but instead of csv i\'m working on JDBC data sources. i\'m trying to connect
This does not work in general. If you are using any type of functionality hosted outside your network that needs to access an API or data on your private network, there needs to be some communication channel.
That channel could be established by setting up a VPN, using products like IBM Secure Gateway to create a client / server connection between the IBM Cloud and your Db2 host, or by even setting up a direct link between your company network and the (IBM) cloud.