But this is already possible. Just an extra step for importing garments separately from alembic: https://forum.reallusion.com/FindPost451054.aspx
It is just someone who is proficient with MD should make a tutorial. I am not an MD pro, but I was able to pull this through easily:

I agree. It would be great to have Alembic Import for soft cloth simulations from Marvelous designer as well. Thanks for this post.

Hoping for this in iClone 8! Many have been asking for better performance to allow bigger projects and this would require some sort of smart caching and various methods of Culling and potentially texture packing that could be turned on or off to make changes.

I think Alembic support would be great although the new Zbrush 2021 came out with MDD support! and although I'd love to have alembic, MDD might come first because not everyone has access to the big programs that can generate advanced water sim.
If Reallusion could support both then they will be opening the flood gates for a bigger market - once the performance optimizations have been implemented. 

Final word - if they add Goz to iClone they can almost instantly create collisions and bake the dynamics then reimport with MDD.

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I would also like to see this feature. I have Cronosculpt which allows real-time corrections of animation sequences. It's great for correcting animation issues such as poke through during a soft-cloth animation, making a quicker workflow then repeatedly trying to adjust settings in an animation over and over because an outfit keeps going where you don't want it to during an extreme movement. I was able to export Alembic from IClone correct it in Cronosculpt but without being able to import :( I couldn't go any further. So please consider adding Import of Alembic.

+1

I also would like to see Alembic import. For me it would be to be able to use simulations such as those from Houdini, which are great for real waves and many others.

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We have the export feature, but I wish to add the ability to IMPORT Alembic files. I'm a DAZ user and what I like to do right now involves blocking out motions and refining them in iClone and then taking them back into DAZ studio to render them. This allows me to take advantage of the greater detail and all the Joint Control Morphs of the DAZ figures that make them amazing to work with. The problem is --I don't really want to render them in DAZ but I want the detail and there's no other way to get all that detail into iClone other than an alembic or MDD import. with the PBR render, I would rather render in iClone. Please give us the ability to import Alembic and/or MDD animations in iClone. It would be a great way to take full advantage of the great features of BOTH platforms. This would open up new possibilities with other systems like Realflow. Or you could do physics stuff like buildings collapsing in another application and then bring it into iClone.

I have included this feature request in the feedback tracker. You can view it here.