What is the correct way to set-up an out-of-tree platform?

[etodanik]

With Metro, there is now a convention that any of the following will be searched for a custom out-of-tree platform:

Quote from the documentation:

• react-native-example - It will search all top-level modules that start with react-native-
• @org/react-native-example - It will search for modules that start with react-native- under any scope
• @react-native-example/module - It will search in all modules under scopes with names starting with @react-native-

What is the best way to setup a similar behavior with repack? I'm currently building my own custom platform for Unreal Engine, and I'm finding repack easier to work with for the JS part, but not 100% sure what's the "right" way to setup a custom platform in the webpack config.