I made simple Swift Macro here is article how to use it
https://kment-robin.medium.com/codable-and-swiftdata-179418b2c460
RobinKment
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The problem was in .intentdefinition where is needed for macOS to have Checked value Siri can ask for value when run. Don't know why but that only helped. If you want to play around with that is still on GitHub.
I recreate the same issue I have with Apple Demo project Fruta repo is here: https://github.com/kmentrobin/Fruta-macOS-Widget