Example of a very basic Azure Automation Runbook that outputs a JSON object

Get-PnPWeb.ps1

Param(    
    [Parameter(Mandatory=$true)]
    [string]$SiteUrl   
)
# ensure that any error stops the job
$ErrorActionPreference = "Stop"

# create connection to SharePoint site
Connect-PnPOnline -Url $SiteUrl -Credentials (Get-AutomationPSCredential -Name "Lundhill")

# get web
$web = Get-PnPWeb

# output json
Write-Output @{WebTitle=$web.Title} | ConvertTo-Json

# clean up SharePoint connection
Disconnect-PnPOnline