WebView2 HTML parsing

The code below embeds a web-scraping test URI into a Webview2 control. The button2 function returns the links for the site, but requires a redundant Invoke-WebRequest. I know Webview2 does not have an internal DOM capability and the $htmlContent = $WebView2.ExecuteScriptAsync() to return HTML is commented out as it does not appear to work. Is there a way to obtain the html without the Invoke-WebRequest()?

function button1
{
   $title = 'Enter New URL to Navigate To'
   $msg   = 'Please enter URL as https://[...some site...].com/.net/.org'
   $url = [Microsoft.VisualBasic.Interaction]::InputBox($msg, $title)
   $url
   if ($url -ne "")
   {
      try
      {
         $WebView2.Source = $url
         $WebView2.Refresh()
      }
      catch { $pop.popup("Invalid or Unuseable URL",2,"Error",4096) }
   }
}

function button2
{
   $links = ( Invoke-WebRequest -Uri $WebView2.Source).Links.Href  | Get-Unique
   $regex = '/product*'
   $links | Select-String $regex | Select line | Out-Gridview -Title "Webpage Links for Products" -PassThru
   #$pop.popup("Code for Scraping Links",2,"Message",4096)
}
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$pop = New-Object -ComObject wscript.shell
New-Variable -Name 'data' -Value "$([Environment]::GetEnvironmentVariable('LOCALAPPDATA'))\Webview2" -Scope Global -Force
$path=$PSScriptRoot  
# Get DLLs
$WinForms = "$path\Microsoft.Web.WebView2.WinForms.dll"
$Core     = "$path\Microsoft.Web.WebView2.Core.dll"

<#
$loader = "$path\WebView2Loader.dll"
$wpf    = "$path\Microsoft.Web.WebView2.Wpf.dll"
#>

Add-Type -AssemblyName Microsoft.VisualBasic
Add-Type -Path $WinForms
#Add-Type -Path $Core
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing

$Form = New-Object System.Windows.Forms.Form
$button1 = New-Object System.Windows.Forms.Button
$button2 = New-Object System.Windows.Forms.Button
$cancelButton = New-Object System.Windows.Forms.Button
#
$button1.Location = New-Object System.Drawing.Point(23, 25)
$button1.Name = "button1"
$button1.Size = New-Object System.Drawing.Size(75, 23)
$button1.TabIndex = 0
$button1.Text = "New URL"
$button1.BackColor = "Green"
$button1.ForeColor = "White"
$button1.AutoSize = $true
#
$button2.Location = New-Object System.Drawing.Point(312, 25)
$button2.Name = "button2"
$button2.Size = New-Object System.Drawing.Size(75, 23)
$button2.TabIndex = 1
$button2.Text = "Links"
$button2.BackColor = "Green"
$button2.ForeColor = "White"
$button2.AutoSize = $true
#
$cancelButton.Location = New-Object System.Drawing.Point(684, 25)
$cancelButton.Name = "button3"
$cancelButton.Size = New-Object System.Drawing.Size(75, 23)
$cancelButton.TabIndex = 2
$cancelButton.Text = "Close"
$cancelButton.BackColor = "Red"
$cancelButton.ForeColor = "White"
$cancelButton.Text = 'Close Window'
$cancelButton.AutoSize = $true
$cancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
$Form.CancelButton = $cancelButton
#
$WebView2 = New-Object -TypeName Microsoft.Web.WebView2.WinForms.WebView2
$WebView2.CreationProperties = New-Object -TypeName 'Microsoft.Web.WebView2.WinForms.CoreWebView2CreationProperties'
$WebView2.CreationProperties.UserDataFolder = $data #keeps it out of $PSScriptRoot  
$WebView2.Source = "https://www.scrapingcourse.com/ecommerce/"
$Webview2.Location = New-Object System.Drawing.Point(23, 65)
$Webview2.Size = New-Object System.Drawing.Size(749, 373)
$WebView2.Anchor = 'top,right,bottom,left'
<#navigation complete
$WebView2_NavigationCompleted = {
    $htmlContent = $WebView2.ExecuteScriptAsync("window.chrome.webview.postMessage(document.documentElement.outerHTML;").Result  
    #$htmlContent = $webView2.CoreWebView2.ExecuteScriptAsync("document.documentElement.outerHTML;").Result
    Write-Host $htmlContent

}
$WebView2.add_NavigationCompleted($WebView2_NavigationCompleted)

$WebView2.add_WebMessageReceived({
    param($WebView2, $message)
    $pop.popup($message.TryGetWebMessageAsString(),3,"Message",4096)
})
#>
$Form.ClientSize = New-Object System.Drawing.Size(800, 450)
$Form.Controls.Add($Webview2)
$Form.Controls.Add($cancelButton)
$Form.Controls.Add($button2)
$Form.Controls.Add($button1)
$Form.Name = "Form"
$Form.Text = "Webview Web Scraping Sample"

$button1.add_click(
{
   button1
})

$button2.add_click(
{
   button2
})

$result=$Form.ShowDialog()
#Terminate if Cancel button pressed
if ($result -eq [System.Windows.Forms.DialogResult]::Cancel) 
{
   [System.GC]::Collect()
   [System.GC]::WaitForPendingFinalizers()
   $form.Dispose()
   Exit 
}
########################################################################################################################