Merge content of two json files in nested form

[N, Vyshali]

Hi,

My requirement is that I want add the entire json content from one file to 
another json file by adding a new attribute.

For example, I have the following content in one file,

{
  Plant: 8415,
  Module: M1
}

The above content should be merged to another json file with the addition of 
"Data" attribute as,

{
  Id:222-2222-2222,
  Data: {
  Plant: 8415,
  Module: M1
}
}

Please let me know the suitable approach

Regards
Vyshali