How do I export a report as a CSV file using python-gvm?

I’ve attempted to write some code to export the scan reports as a csv file:

from gvm.connections import UnixSocketConnection
from gvm.protocols.latest import Gmp, ReportFormatType
import xml.etree.ElementTree as Et

USERNAME = 'user'
PASSWORD = 'blah'
CONNECTION = UnixSocketConnection()

def process_all_reports(xml_data: str) -> list:
        xml_root = Et.fromstring(xml_data)
        return list(set(report_data.get('id') for report_data in xml_root.findall('report')))
    except Et.ParseError as e:
        print(f"Parsing failed!\nDetails: {e}")
        return []

def get_csv_report() -> None:
    Logs into GVM to pull reports and saves them as CSV files.
    :return: None
        with Gmp(CONNECTION) as gmp:
            gmp.authenticate(username=USERNAME, password=PASSWORD)
            #"Authentication successful.")
            print("Auth Success")

            # Get all reports
            raw_reports = gmp.get_reports()
            report_id_list = process_all_reports(raw_reports)
            print(f"got {len(report_id_list)} reports.\nReports: {report_id_list}")
            #"Gathered {len(reports)} reports.")

            # download all reports in csv format
            for report_id in report_id_list:
                    report_data = gmp.get_report(report_id, ignore_pagination=True, report_format_id=CSV_FORMAT)
                        with open(f'report_{report_id}.csv', 'w') as report_file:
                            print(f"Data check:{report_id}: {report_data}")
                            print(f"saved report {report_id} as CSV file")
                    except Exception as e:
                        print(f"Error attempting to write files!\nDetails: {e}")
                    #"saved report {report_id} as CSV file")
                except Exception as e:
                    print(f"Saving report {report_id} failed!\nDetails: {e}")
                    # logger.exception(f"Saving report {report_id} failed!\nDetails: {e}")
    except Exception as e:
        print(f"An error occurred when starting to extract reports!\nDetails: {e}")
        # logger.exception(f"An error occurred when starting to extract reports!\nDetails: {e}")

# Call the function to test

While there is another issue with the code not saving the files, my most pressing issue is that the output of the get_report method seems to produce base64 inside of a xml tree. Unfortunately, there doesn’t appear to be any tags wrapping the base64 string, so I am at a loss how I would be able to extract the string to transform it into something that could be saved as a csv file.
How can I accomplish this? Are there any docs that give a short how to?