(InDesign) Export JPG in multiple resolutions

Hello,

I have got a script which exports all pages at 72dpi and it works perfectly but I am now trying to work out a way to get it to also export at 144 + 216dpi (in the same script). The file name also needs to add '_1x' / '_2x' / '_3x' to the end of the filename. The current script does everything but the different resolutions.

I could create 3 separate scripts but I need to create one script for JPG and another for PNG so I would prefer (if possible) to just have 2 scripts as opposed to 6 - even better would be to have one script that has a popup at the start to choose whether it is a JPG or PNG that we would like to export.

I have a similar script for exporting PDFs which is almost does exactly what we need for this but as JPG/PNG as opposed to PDFs.

If anyone knows of any scripts available you would be a life saver!

var doc = app.activeDocument;
var myFolder = doc.filePath;
var jpg_name = doc.name.replace(/.indd$/i, "");


for(var p = 0; p < doc.pages.length; p++) {
var myPageName = doc.pages[p].name;

// Set JPEG export preferences 1x
app.jpegExportPreferences.properties = {
   antiAlias: true,
   embedColorProfile: true,
   exportResolution: 72,
   // exportingSpread: true, // Uncomment if spreads
   jpegColorSpace: JpegColorSpaceEnum.rgb,
   jpegExportRange: ExportRangeOrAllPages.exportRange,
   jpegQuality: JPEGOptionsQuality.maximum,
   jpegRenderingStyle: JPEGOptionsFormat.baselineEncoding,
   useDocumentBleeds: false,
   simulateOverprint: false,
   pageString: myPageName,
 }

doc.exportFile(ExportFormat.jpg, File(myFolder +"/"+ jpg_name +"_"+"1x"+ ".jpg"), false);
}
alert("Done Exporting jpg's!");