I trust you are well.
I have yet to have tested this myself but potentially setting the field to false might work.
IE - record.values.myDate ?? false : true OR potentially using Nil as described in the forum link
@katrinyordanova, undefined is not a built-in variable. As mentioned above, I’ve tried setting it to false , "" , 0 , and nil none of which worked. The way I set it to nil was by defining a variable without setting its value.