What type of information would you like to insert into your custom fields as code?
Also, when you add a custom field to your email it's a dynamic field so it will pull the content that it in the contact details for each individual contact it is sent to. You will have to live send the email to see the content pull since it's based on the email address it's sending to. In the edit mode this field will show as text with a thin dotted line around it. In test emails and the preview mode the email will populate with your name since it hasn't been sent.
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