{
   "blockType":"when",
   "blockOptions":{
      "method":{
         "name":"isBatteryLevel",
         "args":{
              "comparator":"comparator",
              "value":"value"
         }
      }
   },
   "fields":[
        {
           "name":"comparator",
           "type":"string",
           "value":"<"
        },
        {
           "name":"value",
           "type":"int",
           "value":20
        }
   ]
}