JSON transformation

I want to use a table for larger conversion of data to json format. Here is is how the json code should look like for my api to work.

{

“text” : [“My name is Max Mustermann”],

“source_lang” : “EN”,

“target_lang”: “DE”

}

However when I create it from the table to json node it looks like this. The square bracket is missing on the text tag. Is there a way to do this modification?