var obj = {
    "0": [{
      "category": "A",
      "index": 0,
      "property": "Name",
      "value": "Bob"
    }],
    "1": [{
      "category": "A",
      "index": 1,
      "property": "Name",
      "value": "Jessica"
    }]
}

console.log(Object.values(obj).flat())