Firmar_pdf_python

I have a project based on
https://github.com/parzibyte/firmar_pdf_python

My directory(I have tried to modify the endesive libraries)
C:\Users\Polo\AppData\Local\Programs\Python\Python312\Lib\site-packages\endesive\pdf\PyPDF2_annotate\annotations\signature.py
In this python file, set:
HELVETICA_PATH = os.path.join(os.path.dirname(__file__), "..", "Fonts", "Helvetica.ttf")

Line 165
if block:
    font = self.get_default_font()
    font2 = self.get_default_font()
    cs.extend(processor.text_box('\n'.join(block), font,font2, t_left, 5,(bbox[2]-5)-t_left, height-5))


C:\Users\Polo\PycharmProjects\firmar_pdf_python-main\firmador.py line 20
def firmar(contraseña, certificado,hoja, pdf, qr_img, fecha ):
    #date = datetime.datetime.now()
    date = datetime.datetime.utcnow()
    date2 = datetime.datetime.now()

    print(date)
    print(date2)
    print(qr_img)
    #date2 = date.strftime("%Y-%m-%d%H:%M:%S.%F")
    date2 = date2.strftime("%Y-%m-%dT%X.%F-05:00")
    date = date.strftime("D:%Y%m%d%H%M%S+00'00'")
    # with open("cert.p12", "rb") as fp:
    p12 = pkcs12.load_key_and_certificates(
        certificado.read(), contraseña.encode("ascii"), backends.default_backend()
    )

    x = str(p12[1]).split("=")
    y = x[2].split(",")
    la_signed = "Firmado electrónicamente por: " + str(y[0])
    #  print(x[0])
    #  print(x[1])
    print(la_signed)
    # print(x[3])

    generar_qr(str(y[0]), date2)
    qr_img = "C:/Users/Polo/PycharmProjects/firmar_pdf_python-main/output" + str(y[0]) + ".png"
    dct = {
        "aligned": 0,
        "sigflags": 2,
        "sigflagsft": 132,
        "sigpage": int(hoja),
        "sigbutton": True,
        "sigfield": "Signature1",
        "auto_sigfield": True,
        "sigandcertify": True,
        "signaturebox": (100, 150, 250, 200),
        #"signature": la_signed,
        #"signature_img": qr_img,
        "contact": "",
        "location": "Ubicación",
        "signingdate": date,
        "reason": "Razón",
        "password": contraseña,
        'fontsize': 6,
        "signature_appearance":{
            'icon': qr_img,
            'outline': [0.0, 0.0, 0.0],
            'border': 0,
            'labels': True,
            'display': 'CN'.split(' '),
        },
    }
    print(dct["signature_appearance"])

I need to modify the font of “CN”.
"Signature_appearance":{
            'icon': qr_img,
            'outline': [0.0, 0.0, 0.0],
            'border': 0,
            'labels': True,
            'display': 'CN'.split(' '),