Json request need to send as a list to HTTP body

Hi, my data is as shown in the screenshot.
I need to send this vin numbers to HTTP body in json format as list .
image
to converting my data into json format , i am sending data to json conveter in 2 ways . As table 2. As an Array

  1. sending as a table to jsonconvert.serialize -Json format is as shown below
    [{“Unit1VIN”:“fdfmkf”},{“Unit1VIN”:“jfjdnfjn”},{“Unit1VIN”:“dfkdkdf”},{“Unit1VIN”:“mkfmk”},{“Unit1VIN”:“mlkmkd”},{“Unit1VIN”:“ldl”}]
  2. sending as a array to jsonconvert.serialize - Json format is as shoen below
    [",lftglll",“gk”,“mkgmk”,“mkfmgk”,“mggl”,“fgl”]

but i need to send in the below format along with Header but header should be only once.
“Unit1VIN”:[“lftglll”,“gk”,“mkgmk”,“mkfmgk”,“mggl”,“fgl”]