how can insert data into list from nested array?

data = [
   { "item": "journal", "instock": [ { "warehouse": "A", "qty": 5 }, { "warehouse": "C", "qty": 15 } ] },
   { "item": "notebook", "instock": [ { "warehouse": "C", "qty": 5 } ] },
   { "item": "paper", "instock": [ { "warehouse": "A", "qty": 60 }, { "warehouse": "B", "qty": 15 } ] },
   { "item": "planner", "instock": [ { "warehouse": "A", "qty": 40 }, { "warehouse": "B", "qty": 5 } ] },
   { "item": "postcard", "instock": [ { "warehouse": "B", "qty": 15 }, { "warehouse": "C", "qty": 35 } ] }
]

# Access the nested array for the "paper" item
paper_instock = data[2]["instock"]

# Append a new item to the nested array
new_item = { "warehouse": "C", "qty": 10 }
paper_instock.append(new_item)

# Print the updated data
print(data)