json-element-replace.ps1

Get-ChildItem -Recurse -Filter *.json |
    ForEach-Object {
        Write-Host $_.Name
        Write-Host $_.FullName
        $jsondata = Get-Content -Raw -Path $_.FullName | ConvertFrom-Json
        $jsondata.scenario | Where{$_.Label -eq 'SELECT in Benchmark'} | ForEach{$_.Type = 'SelectString'}
        $jsondata.scenario | Where{$_.Label -eq 'SELECT in Benchmark'} | ForEach{$_.StringSelection = 'Under 65 Population'}
        $jsondata | ConvertTo-Json -depth 100 | Out-File -LiteralPath $_.FullName
    }