json - 定义密钥对的数量然后填充它们 json

Question

 {
"sender":{
   "email":"no-reply@example.com",
   "name":"John"
},
"subject":"<This is my default subject line>",
"templateId":1,
"params":{
   "greeting":"This is my default greeting",
   "headline":"This is my default headline"
   
},
  
      "to":[
         {
            "email":<to email>
        
         }
      
      ]      

}

我可以在代码的任何地方传递一个字符串。该字符串将是电子邮件地址。然后，我想根据该字符串的长度创建额外的密钥对，以将所有电子邮件地址传递给 sendinblue