Error in Loading nested and repeated data to bigquery?

I am getting JSON response from a API. I want to get 5 columns from that,from which 4 are normal,but 1 column in RECORD REPEATED type. I want to load that data to Bigquery table. Below is my code in which Schema is mentioned.

import requests from requests.auth import HTTPBasicAuth import json from google.cloud import bigquery

import pandas
import pandas_gbq



URL='<API>'

auth = HTTPBasicAuth('username', 'password')
  
# sending get request and saving the response as response object
r = requests.get(url=URL ,auth=auth)
  

data = r.json()

----------------------json repsonse----------------

{ "data": { "id": "jfp695q8", "origin": "taste", "title": "Christmas pudding martini recipe", "subtitle": null, "customTitles": [{ "name": "editorial", "value": "Christmas pudding martini" }] } }

id=data['data']['id']
origin=data['data']['origin']
title=data['data']['title']
subtitle=data['data']['subtitle']
customTitles=json.dumps(data['data']['customTitles'])
# print(customTitles)

df = pandas.DataFrame(
    {
'id':id,
'origin':origin,
'title':title,
'subtitle':'subtitle',
'customTitles':customTitles

    },index=[0]
)

# df.head()


client = bigquery.Client(project='ncau-data-newsquery-sit')
table_id = 'sdm_adpoint.testfapi'

job_config = bigquery.LoadJobConfig(
    schema=[
    bigquery.SchemaField("id", "STRING"),
    bigquery.SchemaField("origin", "STRING"),
    bigquery.SchemaField("title", "STRING"),
    bigquery.SchemaField("subtitle", "STRING"),

bigquery.SchemaField(
        "customTitles",
        "RECORD",
        mode="REPEATED",
        fields=[
            bigquery.SchemaField("name", "STRING", mode="NULLABLE"),
            bigquery.SchemaField("value", "STRING", mode="NULLABLE"),



])

    ],
        autodetect=False

    )
df.head()
job = client.load_table_from_dataframe(
    df, table_id, job_config=job_config
)

job.result()

customeTitle is RECORD REPEATED fiels, which has two keys name and values, so I have made schema like that. Below is my table schema.

Below is output of df.head()

jfp695q8 taste Christmas pudding martini recipe subtitle [{"name": "editorial", "value": "Christmas pudding martini"}]

Till here its good. But ,when I try to load the data to table it throws below error.

ArrowTypeError: Could not convert '[' with type str: was expecting tuple of (key, value) pair

Can anyone tell me whats wrong here?