How to export Metahumans to Marvelous Designer?

Following these 2 tutorials, I can’t figure out how to export Metahuman skeletal mesh.
It’s a shame that these 2 articles both skip this crucial export step, and directly start with the import in Marvelous…

Did I miss an article or something?
(I found vague tutos on YT, but I’d rather rely on clear and official instructions)