You can add custom fields by creating the same in CUP Go in Configuration -> Custom Fields. The fields you create here will be visible in the request form for the user to fill in addition to the standard fields . You can take a look at the Access Control 5.3 configuration guide for information on how to create custom fields.
Just a word of caution - please make sure you need those custom fields: after you have created a custom field and used it in a request, there's no way of deleting it again, or getting it off of your request form easily!
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