Modify Alert recipients in Bulk using API

Hi,
I am trying to modify alerts assigned by default to admin user and master group to some other users/groups. I have found another thread where @Venu Kondabhathini  suggested using API.

I am trying to use JSON file from

https://documentation.commvault.com/2022e/essential/rest_api_post_alert_modify.html

But when I am trying to load this it gives me an error:
$body = Get-Content -Raw -Path $pathToJSON | ConvertFrom-Json

ConvertFrom-Json: Conversion from JSON failed with error: Unexpected character encountered while parsing value: }. Path 'alertDetail.alertDetail.appTypeFilterList.appTypeFilter[0]._type_', line 15, position 16.

I am using Powershell.

Is anyone using this? Is this file broken?