Is there any easy way to build complex JSON data from BML

Summary:

Is there any easy way to build complex JSON data from BML 

Content (required):

yes

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

sample JSON data. I need to create this JSON string dynamically

{
    "documents" : {

            "subArray_2": {

                "items" : [

                    {

                        "subArr_Integer": 999,

                        "subArr_Text": "testing all new sub"

                    }

                ]

            }

        }
}