jq ' to_entries '

cat data/ann.json | jq ' .metadata.annotations ' cat data/ann.json | jq ' .metadata.annotations | to_entries ' 
{
  "deployment.kubernetes.io/revision": "1",
  "machine.openshift.io/owned": "",
  "label1": "stam",
  "label2": "another",
  "label3": "one"
}
    
[
  {
    "key": "deployment.kubernetes.io/revision",
    "value": "1"
  },
  {
    "key": "machine.openshift.io/owned",
    "value": ""
  },
  {
    "key": "label1",
    "value": "stam"
  },
  {
    "key": "label2",
    "value": "another"
  },
  {
    "key": "label3",
    "value": "one"
  }
]