This doesn't seem like a bad idea. Referring to an extract as part of your introduction technically follows the same basis for referring to a whole text(s) in your introduction. Essentially, the primary consideration is that you must make close references to the extract(s) provided in the case of questions such as Question 1 (a) from the 2021 English Advanced HSC Exam Paper 2, being:
How do the extracts provided contribute to a broader textual conversation between the pair of prescribed texts that you have studied in Module A?
Subsequently, you can expand on the ideas you establish in your introduction, whether they are inspired from the extract(s) or from your own knowledge and understanding of the module and your prescribed text(s), as part of your body paragraphs, where you will also need to refer to and use the extract, whether it be to discuss a relevant quote or technique and possibly include additional quotes and techniques that extend beyond the extract(s) provided in order to further support your main points, hopefully resulting in a good quality piece.
I hope this helps!
