Hey, Do you mean exporting the output ? as in the custom shapes you created in the output ?
if yes then its pretty straight forward
Export it as SVG bring it in Adobe Illustrator, Break the group apart and Delete the lines and shapes you don't need.
All you are then left with is the custom shapes.
you can then simply copy them and past them in say Adobe After effects on a solid shape to make masks or something.
Hope this helps you achieve your goal.