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I think there is an open issue for that

Depending on what you want to compute, using a ValueSource might be an alternative.

Yeah, that is not supported atm. But it would be very convenient. Note that Gradle would still need to write output to some file one way or another, because of up-to-date checks and caching. But it would be very convenient that Gradle would do that behind a scene and user wouldn't need to work with files.