Seems that MIGX (grid input for input parameters like unlimited Product attributes) has currently only output for images.

The following solution is maybe the first published variant of solving this:

If the attributes tv has a grid input in JSON format:

[{"caption":"Product attributes", "fields": [{"field":"title","caption":"Title"},{"field":"value","caption":"Value"}]}] of tabs and Grid: [{"header": "Title", "width": "160", "sortable": "true", "dataIndex": "title"},{"header": "Value", "width": "160", "sortable": "true", "dataIndex": "value"}]

Then the following snippet call

[[[attributes?attributes=``]]

will run through the JSON values and return output:
if(isset($attributes) && $attributes != ''){   

$attributes = $modx->fromJSON($attributes);  //print_r($attributes); die;   

if(is_array($attributes)){     $ret = '';       

          foreach($attributes as $k=>$v){           

          $ret .= '<li>                          <ul>                                 <li>'.$v['title'].'</li>                                 <li class="rt">'.$v['value'].'</li>                          </ul>                   </li>          ';       

            }      

           return $ret;   

   } else return '';
} else return ''; 

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