Powershell script to generate audio using google text-to-speech service

powershell-google-tts.PS1

# Requirements:
# - active google cloud project
# - enable 'Cloud Text-to-Speech API'
# - GOOGLE_APPLICATION_CREDENTIALS defined as an environment variable, pointing to your JSON account key file
# - Google Cloud SDK installed and initialized

# Based on official quickstart example: https://cloud.google.com/text-to-speech/docs/quickstart-protocol

$dialogue = Read-Host -Prompt 'Dialogue text'
$outputName = Read-Host -Prompt 'Output file name (.mp3 extension will be added automatically)'
$cred = gcloud auth application-default print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }
@{input=@{text=$dialogue};voice=@{languageCode="en-US";name="en-US-Wavenet-C"; ssmlGender="FEMALE"};audioConfig=@{audioEncoding="MP3"}} | ConvertTo-Json -Compress | Out-File -FilePath request-temp.json

Invoke-WebRequest `
  -Method POST `
  -Headers $headers `
  -ContentType: "application/json; charset=utf-8" `
  -InFile request-temp.json `
  -Uri "https://texttospeech.googleapis.com/v1/text:synthesize" | Select-Object -Expand Content | Out-File -FilePath response.json

$JSONContent = Get-Content -Path "response.json" | ConvertFrom-JSON -AsHashtable
$JSONContent.Values | Out-File -FilePath audioContent.base64
certutil -decode audioContent.base64 $outputName".mp3"

Hi there,
Is there a way to convert or add feature to accept file name (with text ) that can be converted to .mp3
Thanks for your help.
-Max.