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Using jq :

$ cat json
[
  {
    "item1": "value1",
    "item2": "value2",
    "sub items": [
      {
        "subitem": "subvalue"
      }
    ]
  },
  {
    "item1": "value1_2",
    "item2": "value2_2",
    "sub items_2": [
      {
        "subitem_2": "subvalue_2"
      }
    ]
  }
]

CODE:

arr=( $(jq -r '.[].item2' json) )
printf '%s\n' "${arr[@]}"

OUTPUT:

value2
value2_2