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When I try to use directly, I get this error:

* What went wrong:
Execution failed for task ':analyzeResults'.
> Cannot fingerprint input property 'extension': value 'extension 'weeklyReport'' cannot be serialized.

task input is Nested and all public properties have correct input annotations. Google "authoring Gradle tasks"

It can be done, though a more idiomatic approach is to pass in just what is required. Your error is due to having data types in the extension that are not Setializable.