Как разделить строку json на куски?

import json
jsn = '{"time": 1618977514201, "price": "0.31350000", "quantity": "127.00000000"}'
list_val = list(json.loads(jsn).values())
list_keys = list(json.loads(jsn).keys())
print(list_val, len(list_val))  # => [1618977514201, '0.31350000', '127.00000000'] 3
print(list_keys, len(list_keys))  # => ['time', 'price', 'quantity'] 3

def divide_chunks(l, n):
      
    for i in range(0, len(l), n): 
        yield l[i:i + n]
 
lst_message = cursor.fetchall()
 
str1=''
 
for item in lst_message:
  for item1 in item:
    str1=str1+item1
 
 
str_message = str1.replace('][',',')
 
chunks = str_message.split('},{')
 
chunks[0] = chunks[0][1:] + "}"
chunks[-1] = "{" + chunks[-1][:-1]  
 
 
 
for i, elem in enumerate(chunks[1:-1]):
  chunks[i] = "{" + elem + "}"
 
x = list(divide_chunks(chunks, 10000))
 
 
credentials = pika.PlainCredentials(log, passw)
parameters = pika.ConnectionParameters(host = ser, credentials = credentials)
connection = pika.BlockingConnection(parameters)
channel = connection.channel()
channel.queue_declare(queue='ScheduleLoad', durable=True)
 
for message in x:
    str_rabbit = ''
    for item in message:
        str_rabbit = str_rabbit + item + ","
 
    str_rabbit = "[" + str_rabbit[:-1] + "]"
        
    channel.basic_publish(exchange='',
                          routing_key='ScheduleLoad', 
                          body=str_rabbit)
    print(" [x] Sent 'Запрос отправлен в очередь rabbitmq'")
connection.close()