There is none. The problem is that MAL would need to write a parser to parse our lists and given that MAL is completely proprietary, we can’t just submit a feature addition to their site to make this experience easier. As long as MAL doesn’t cooperate, exporting to it is impossible, though you could technically still write a save data translator which takes the notify.moe data and reconverts it into a format that MAL accepts, but that would not only be hacky but also delete major parts of the data given that notify.moe has a lot of features that are different from MAL. (e.g. decimal scoring)