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I believe the issue https://github.com/pulumi/pulumi/issues/2307 describes the feature that you are looking for. Latest activity is that it was removed from 0.30 milestone. Currently, I think that you have to repeat your shared configuration in all stacks.

Personally I've created a dynamic provider that loads a json file, validates it against a json schema, and loads outputs with it's values.

The typical solution is to set the defaults in your code. If you have shared defaults at the project level (most common and sounds like the case you have here?) then this is works particularly well. For more complex configuration inheritance - you can just do it in code as @echoing-breakfast-73834 suggests - though you shouldn’t even need a dynamic provider - you code can just read files off disk that define your own customized notion of configuration defaults inheritance.

Sorry I should have clarified - the only reason I'm using a dynamic provider is so that all the properties from the config are grouped together in the state. Makes tracking some things much easier. If that wasn't important to me specifically I'd 100% just read the file.

Thanks for your replies! Sadly the config value is not possible to be imported. I will check your suggestion in the future. For now, manually add duplicated configuration is easier for my case.

Can your share your dynamic provider code?