Get-ProvisioningTemplate.ps1

function Get-WebParts($fileName){
    $pageFile = $librarySitePages + "/" + $fileName
    
    $web = Get-PnPWeb
    $serverRelativePageUrl = $web.ServerRelativeUrl + $pageFile
    $serverRelativePageUrl
    #Get all web parts
    $webParts = Get-PnPWebPart -ServerRelativePageUrl $serverRelativePageUrl
    $count = 0

    foreach($webPart in $webParts){
        $count++
        $xml = Get-PnPWebPartXml -ServerRelativePageUrl $serverRelativePageUrl -Identity $webPart.Id
        $newFileName = "webpart_" + $fileName + "_" + $count.ToString() + ".xml"
        #Save file to locale
        Set-Content -Path $newFileName $xml -Force
    }
}