Possibly, but you really don't want to do it with validators.
You should only do things that make changes in transitions during post-functions (or listeners that happen even later). Validators are totally the wrong place.
So, the question is - what do you want to do when the issue moves to complete?
is it possible to verify Epic->some field contains value, when Task " is set to completed.
The task should not be able to be set to Completed, if the Epic->that field is not set.
What does "epic some field" mean?
it means any field in that epic
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