{
  "dimensions": ["product", "category"],
  "source": [
    { "product": "data1", "category": 20 },
    { "product": "data2", "category": 40 },
    { "product": "data3", "category": 60 },
    { "product": "data4", "category": 80 },
    { "product": "data5", "category": 100 }
  ]
}