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I would say that you can't (and that you have a design problem rather than a technical one). I suppose that you can actually read the current value (eagerly!) and then set it (same with any kind of Property btw, not just ListProperty)

I know I have a design problem, but it is too much to change it right now 😅

WDYT of adding another list property that builds upon the original one? In other words, ListProperty.map { … } which creates the “updated list property”

actually your idea with additional input is better then using

afterEvaluate { ... }

. Thank you!