VAM can import it as CustomUnityAsset (CUA) - but that's not like a Person Atom in VAM that you can dress and play around with.
It's more like part of the scene / environment then. Just a boring scene object.
I guess that's not what you want.
You would have to start by getting the 'shape' of your character into VAM with a morph.
All morphs in VAM rely on the DAZ Genesis 2 mesh being used.
So you'd have to import your model into DAZ Studio somehow.
Match your models pose to the Genesis 2 T-pose and then fit the G2 mesh to your model.
You'd lose detail due to the fitting not being 100% precise obviously.
Then create of morph of that G2 model export -> open VAM and apply it to the default model.
Part of this guide should help:
https://hub.virtamate.com/resources/import-genesis-8-character-to-vam-with-pictures.6260/
Note: before step 19 make sure the new morph slider is at 100%
I did successfully ports with it from DAZ to VAM, but it's easy to F this up.
Have not ported textures yet. There are guide for that too.