如果范例中的 JSON 层级比较多少，如何准确定义到指定的值（entry[0].changes[0].message.body），例如
{
"object": "whatsapp_business_account",
"entry": [{
"id": "357803844086198",
"changes": [{
"value": {
"messaging_product": "whatsapp",
"metadata": {
"display_phone_number": "xxx",},
"contacts": [{
"profile": {
"name": "xxx"
},
"wa_id": "85270767350"
}],
"messages": [{
"from": "xxxx",
"timestamp": "1722387624",
"text": {
"body": "xxx"
},
"type": "text"
}]
},
"field": "messages"
}]
}]
}
