cinder/api-ref/source/v3/samples/volume-manage-list-response.json

{
  "manageable-volumes": [
    {
      "safe_to_manage": false,
      "reference": {
        "source-name": "volume-3a81fdac-e8ae-4e61-b6a2-2e14ff316f19"
      },
      "size": 1
    },
    {
      "safe_to_manage": true,
      "reference": {
        "source-name": "lvol0"
      },
      "size": 1
    }
  ]
}