Facing issue building bar chart

Summary: I want to build bar chart for below json rest connection but facing some issue:

x- axis :  unit number

y-axis : HoursSinceLastMaintenance

{

      "UnitNumber": "2WD103   ",

      "ServiceType": "PMWSL1 ",

      "CompletedDate": "11/29/2021",

      "PercentageDue": "122",

      "ServiceHours": "350000",

      "CompletedHours": "429638",

      "LastCompletedHours": "0",

      "BusinessUnit": "",

      "AccCls": "50 ",

      "EqmCls": "SM ",

      "HoursSinceLastMaintenance": "429638"

    }

Console log:

Network log: