default value when hidden()

I created a field that is only visible when a toggle is set (using visible()). This works fine, but when I update the field value AND toggle the field mentioned, the value of this field is not saved. I understand why this is the case: the field is not included in the post-data because it's not visible.
Is there a way to set a "default"-value when the field is not visible? dehydrateStateUsing() does not seem to work (even with dehydratedWhenHidden()?

I know I could use the lifecycle-hooks, or even model-events but I want to include it in the form (to keep it all together). Any ideas?
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