Bubble is an easy no code tool but when it comes down to CheckBox value it gets unnecessarily tricky (my opinion) if you are creating a new record (Create New Thing).
In the Create New Thing you should be able to Assign a YES/NO field in your database to a Checkbox WhateverName's value. Just like you can with other fields.
The way I do this now is have two workflow items. Each with one conditional, if checked then assigned YES and if unchecked assigned NO.
Perhaps there is a reason why it isn't this way? Is there a specific reason why this was not implemented in this way from the beginning?
Sure would make it more intuitive to new users.