So far, my attempts have failed.
A little more background:
One can initiate an export by diligently populating an array of export settings, and passing it to an export session constructor (LrExportSession), then starting the export (e.g. doExportOnNewTask).
e.g. this is how Export Manager initiates multiple exports. But I don't see how to add export filter specifications to the export settings, thus, people are not able to to initiate multiple exports via presets which include export filters. Most people don't need to do that, but for the ones who do, it's a real bummer.