我有一个列表，其中包含到json中节点的路由。如何访问基于该路由的节点？

import json

# 假设您有一个包含JSON数据的字符串
json_data = '''
{
  "employees": [
    {
      "firstName": "John",
      "lastName": "Doe"
    },
    {
      "firstName": "Anna",
      "lastName": "Smith"
    },
    {
      "firstName": "Peter",
      "lastName": "Jones"
    }
  ]
}
'''

# 解析JSON数据
data = json.loads(json_data)

# 定义路由
route = "employees[0].firstName"

# 导航到目标节点
node = data
for key in route.split('.'):
    if '[' in key:
        index = int(key[key.index('[') + 1:key.index(']')])
        key = key[:key.index('[')]
        node = node[key][index]
    else:
        node = node[key]

# 访问目标节点的值
print(node)  # 输出：John