Preview reusable element in a popup but zoom out (show a smaller version)

Hi,
I’m using a plugin to export a reusable element in which I have to define precisely the margin, gap size, text size… etc (settings of an A4 size document).
My workflow is button → show popup with reusable element → confirm & export PDF
Everything is working great, however, A4 document’s dimension is really big (2480x3508 pixels), is it possible to show the popup preview in a “zoom out” mode with 1/3 of the real size?
Thanks.