It sounds like you'll need to create it. Why do you think it exists currently if it isn't in the custom field list?
I suspect this is related to " https://answers.atlassian.com/questions/15292430 " and it's starting to make me think the question needs to be clarified - what do you think is missing here? What field are you looking for?
If you go to edit a screen (as an admin), you are given a list of all fields in the system, so if you think something is missing from there, then it's because you have not added it to the custom field list...
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