Calculation result triggers "Fail" checkbox Export Value

Hello! Hopefully you can help me with this question.
I created a calculation field. I also have two identical checkboxes with pass or fail export values.
If the calculation exceeds 1.422, I want it to automatically trigger "Fail" in the checkbox. Is there a way to do this, Please?
 
Fyi, here is the calculation in the "A" field:
 
var v1 = getField("A").value;
var v2 = getField("B").value;
event.value = v1 - v2;