Extracting ContentData

I can extract the value as under:-

"@json(base64toString(triggerBody()['ContentData']))['PostEntityImages'][0]"=
{
    "Attributes": [
      {
        "key": "name",
        "value": "Top Hill Farms Ltd1"
      },
      {
        "key": "businesstypecode",
        "value": {
          "__type": "OptionSetValue:http://schemas.microsoft.com/xrm/2011/Contracts",
          "Value": 1
        }
      },
      {
        "key": "emailaddress1",
        "value": "abc@dfg.co.uk"
      },
      {
        "key": "telephone1",
        "value": "1234888488889999kkssssaakkkkllkkkkkllkkkkwwz"
      },
      {
        "key": "websiteurl",
        "value": "https://www.msn.com"
      }
    ],
    "EntityState": null,
    "FormattedValues": [
      {
        "key": "businesstypecode",
        "value": "Default Value"
      }
    ],
    "Id": "443d49f2-1d61-e811-8106-5065f38b16a1",
    "KeyAttributes": [],
    "LogicalName": "account",
    "RelatedEntities": [],
    "RowVersion": null
  },

how can I extend this code to get the value of telephone1?