Create inherited processes via CLI

was wondering if there is a set of arguments that allow for Creation of inherited processes? I have searched everywhere.
If not, I am having a hard time invoking the webservice command do it. I can do it via normal Rest API. However, I would like to run the whole script using Azure CLI and not jump back and forth.

Here is the script I am running. Also, why does it have to be a file.. why can't it be a variable

```

$createProcessURL = "$orgUrl/_apis/work/processes?api-version=6.0-preview.2"

$ProcessTemplate = @{name = "Agile - $($proj)";parentProcessTypeId = "adcc42ab-9882-485e-a3ed-7678f01f66bc";referenceName = "$($projectName).MyNewAgileProcess";description = "My new process"} | ConvertTo-Json

#$response = Invoke-RestMethod -Uri $createProcessURL -Method Post -ContentType "application/json" -Headers $header -Body ($ProcessTemplate)

$ProcessTemplate | Out-File -FilePath "C:\PS Testing\body.json"

az devops invoke `
--area process `
--accept-media-type "application/json" `
--api-version=6.0-preview `
--http-method "post" `
--org "https://dev.azure.com/silverscout" `
--in-file "C:\PS Testing\body.json"
```

Error I am getting..
```
az : ERROR: Unable to decode file 'C:\PS Testing\body.json' with 'utf-8' encoding.
At line:5 char:1
+ az devops invoke `
+ ~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (ERROR: Unable t...tf-8' encoding.:String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError
```