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Yes, you can do this. Or you can use any other configuration technology; your preferred language may have a better way of sharing configuration "above" stack level. If you want to use Pulumi's provided configuration features, you wouldn't use

pulumi.Output()

specifically (though that would be used in the implementation). You would use a separate project, probably with only one stack (or at least, very few). And you would get shared configuration from that project/stack through stack references.

Note we do have plans to extend project config to also support global config: https://github.com/pulumi/pulumi/issues/11550

Excellent thank you both for the input. For the time being, I was going to do the meta-project approach that you mentioned @little-cartoon-10569 (I think that's how I originally was trying to explain this so we both are thinking the same thing). This meta-project would just have a single stack that defines a bunch of namespaced config, that just does a bunch of

pulumi.export()

on. This could be a simple stop-gap until global configuration becomes a thing as Fraser mentioned and shouldn't be too hard for me to switch away from.