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do you want to download values file from the given url?

considering that pulumi uses fully fletched programming language, you can make HTTP call (e.g. using requests or httpx in python), get values and pass it to HelmRelease resource

Although, I’d think twice before implementing that as it can give you non deterministic outputs. That is, without any changes to pulumi project source code, it can generate different outputs or fail if the external API is not available.