How to add text more than 3000 char in 1 or 2 fields with Purchase order

Summary:

Please advise to enter the more than 3000 char terms & Co with PO. first, we try to use the attachment, but due to the limitation developer cannot display the text on PO print from the attached file, then we try to use the DFF where user cannot enter more than 150 char

is there way to enter more than 3000 chars in any field or any other workaround to display the T&C on PO?

Content (required):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):