The correct place to put text (a transcript) from a source that pertains to the citation is the field title "Citation Text".
This field when exported to a GEDCOM has the definition of: "A verbatim copy of any description contained within the source. This indicates notes or text that are actually contained in the source document, not the submitter's opinion about the source. This should be, from the evidence point of view, "what the original record keeper said" as opposed to the researcher's interpretation."
If the text is too long or you want additional information an appropriate place to put source_citation information is a source.media image of the page from the document. The NOTEs tab is for entering "Comments or opinions from the submitter" about the source_citation, for example a comment from you the reader saying that the handwritting is not completely legable and your thoughts about the possible words. Or that the interview was taken while the interviewed was drunk, distraught, or on their death bed. The reason NOTEs generally do not get printed in reports is that they are normally for the researchers eyes not public consumption.