Nested datasource plugin with backend

Hello,
I’d like to create an app plugin with nested datasource with backend plugin and nested panel plugin. I’ve already developed datasource plugin with its own backend. In the guide:

there is a note:
“each nested data source can have its own backend, independent of the app plugin’s backend.”
How to do it?
I’m not able to find any example of hot to include datasource bakend code into an app backend code.

Follow this part of the guide Work with nested plugins | Grafana Plugin Tools

in short: bootstrap a new data source plugin and copy some of the files into your app. That’s it.

If the nested datasource has a backend, Grafana will pick it up and start it.