There’s a few ways you can use dataprep to do this. You can assign metadata id tags before export, and assign a material to each tag on import. Alternatively if you have a naming structure on your imported objects, such as “xxx_GLASS” you can assign materials based on keywords.
It’s been a while since I used dataprep so I can’t go into much more detail, I abandoned datasmith in favour of FBX because it was too cumbersome.