Theoretically it's possible; let's try to add it in the nightly build.
A little bit of warning though: The way Mannequin works with clothes is more complex than common dress-up games, with deformations and layer optimizations based on what clothing that are used. So while exporting is just a matter of whitelisting what layer ID that will be rendered, stitching the result back together might be not quite easy for the more complex clothing combos.