Using PSWriteHtml and Universal Dashboard

PSWriteHtmlAndUd.ps1

Import-Module PSWriteHTML

New-HTML -TitleText 'My diagram' -UseCssLinks -UseJavaScriptLinks -FilePath $PSScriptRoot\pswritehtml\diagram.html {
    New-HTMLPanel {
        New-HTMLDiagram {
            New-DiagramNode -Label 'One node' -To 'Second node','Third node' -ColorBackground Bisque
            New-DiagramNode -Label 'Second node'
            New-DiagramNode -Label 'Third node'
        }
    }
}

$Folder = Publish-UDFolder -Path "$PSScriptRoot/pswritehtml" -RequestPath "/pswritehtml"
Start-UDDashboard -Dashboard (New-UDDashboard -Title 'Dashboard' -Content {
    New-UDElement -Tag 'iframe' -Attributes @{
        style = @{
            height = '100ch'
            width = '100%'
        }
        src = "/pswritehtml/diagram.html" 
    } 
}) -Port 10000 -Force -PublishedFolder $Folder