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I don't think this is possible without modifying terraform itself. Adding a "terraform" provider is an interesting idea, but I can't see it'd work in practice

Not an answer to your question about a TF provider, but you can use Terraform's

external

data source to access Pulumi stack outputs. Here's an example - https://gist.github.com/clstokes/80cddb26e2defd708d499ed0c081d87c.

Thank you both!

You're welcome. 😁