I have the following custom WebApiSkill:

@app.route(route="CustomSplitSkill", auth_level=func.AuthLevel.FUNCTION)
def CustomSplitSkill(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')

    try:
        req_body = req.get_json()
    except ValueError:
        return func.HttpResponse("Invalid input", status_code=400)

    try:
        # 'values' expected top-level key in the request body
        response_body = {"values": []}
        for value in req_body.get('values', []):
            recordId = value.get('recordId')
            text = value.get('data', {}).get('text', '')

            # Remove sequences of dots, numbers following them, and
            # any additional punctuation or newline characters, replacing them with a single space
            cleaned_text = re.sub(r"[',.n]+|d+", ' ', text)

            # Replace multiple spaces with a single space and trim leading/trailing spaces
            cleaned_text = re.sub(r's{2,}', ' ', cleaned_text).strip()

            # Pattern to match sequences of ". " occurring more than twice
            cleaned_text = re.sub(r"(. ){3,}", "", cleaned_text)

            chunks = split_text_into_chunks_with_overlap(cleaned_text, chunk_size=256, overlap_size=20)
            
            # response object for specific pdf
            response_record = {
                "recordId": recordId,
                "data": {
                    "textItems": chunks
                }
            }
            response_body['values'].append(response_record)

        return func.HttpResponse(json.dumps(response_body), mimetype="application/json")
    except ValueError:
        return func.HttpResponse("Function app crashed", status_code=400)

The inputs and outputs of this skill in the skillset are defined like this:

inputs=[
    InputFieldMappingEntry(name="text", source="/document/content")
],
outputs=[
    OutputFieldMappingEntry(name="textItems", target_name="pages")        
],

How should I extract page information for each chunk?