Specification of FilterData for "save transparency" while controlling PNG output

I am looking for a bit of guidance here, as I have been searching for a few days now and just can’t seem to find the correct settings I am after.
I am using JodConverter to convert images to PNG. I need to know the FilterData of “save transparency” for controlling the JodConverter to return images without white border.
Please, need your help😭

Quesion solved. Use :
filterData.put(“Translucent”, 1);
to save transparency.

But then I was wondering how to use “Image Export” other than “Export” in File Tag?
Is some kind of LoadProperties or Filter can be used?