Rename each page individually

all you need is this brilliant script!

https://www.marspremedia.com/software/indesign/export-named-pages

var outputs = "1080x1080_DE\
1080x1920_FR\
1080x1080_BE\
1080x1920_UK\
1080x1080_NZ\
1080x1920_AUS";
var doc = app.activeDocument;
for(var i = 0; i<=doc.pages.length-1;i++){
        var output_filename = outputs.split("\n") + ".jpg";
        var pageName = doc.pages.name;
        app.jpegExportPreferences.jpegExportRange=ExportRangeOrAllPages.EXPORT_RANGE;
        app.jpegExportPreferences.pageString = pageName;
        doc.exportFile(ExportFormat.JPG,File("~/Desktop/" + output_filename));
}

Using the Mac Platform, saving to the Desktop.

Just change the outputs variable, and as long as you have the same amount of pages in your document that the outputs variable is looking for then you're sweet!

There is no error handling in this..

Have a workaround, no script required.

1 In indesign save pages as PDF
2 In acrobat pro, make bookmarks from structure (here you can choose your indesign paragraph style)

3 Acrobat names the bookmarks with the contents in your paragraph style

4 In acrobat split document based on the bookmark names.

5 You now have a PDF file per bookmark with custom filenames (content of text in paragrap styles)

6 In photoshop open 1 PDF and apply your settings (crop box, dimensions, resolution...)

7 In photoshop use the image processor to convert the PDF's to JPG's

this works for me...

Though scripters do pop in here, you can ask in the scripting forum.

But it might help to let us know what the endgame is here. Why are you doing this?