chart

{  
   "extra_html":{  
        "columns":{  
            "col-1":{ 
                "prefix": {html tag class},
                "suffix": {html tag},
            },
            ...
        }
   },
   "elements": [
       {
            "key": "chart_title",
            "type": "text",
            "label": "Chart Title",
            "position": "1"
        }
    ],
   "chart_cell_tag": {html tag},
   "showImage": false
}

generic widget

{
    "elements": [
        {
            "key": {key_name},
            "type": {type}, // json, wysiwyg, text...
            "label": {label_text},
            "position": {position} // 1,2,3...
        },
    ...
    ],
    "showImage": false //image load button
}