Unable to separate data from JSON to CSV in a column format using powershell

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PowerShell

Using Powershell.

Problem:

Data coming from JSON API request & Stored in Variable "$Ticket".
When i export it to CSV using Export-CSV, data not populating in Column format instead coming in Row format for Custom_field & Values.

Code Result Coming in Row Format:
=====================================
URL Custom_field Values

https://<url>.com/api/31325.json 45504409, 360000890277, GSL,False,False
,27190369, 38670589,



Expected Result Should be in Columns for (Custom_Field & Values ) to be Exported as CSV.
========================================================================================

URL Custom_field Values

https://<url>/api/v2/tickets/31325.json 45504409 GSL
https://<url>/api/v2/tickets/24422.json 360000890277 False

What I have tried:

<===========Code Start===========>

$outputfiles = 'C:\outputfile2.csv'

$tickets | Select-Object URL,  @{Name="custom_fields";Expression={$_.custom_fields.id -join ", "}}, @{Name="Values";Expression={$_.custom_fields.value -join ", "}}` | Export-Csv -Path $outputfiles -NoTypeInformation

<=============Code End=============>