Shapr3D export to Lumion

I drew an apartment in shapr3D
I use Lumion for my rendering
The problem for me is that when I export my obj file to Lumion
Lumion does not understand groups (windows, doors, walls, etc.)
I have to apply my texture to each of the objects!
I contacted Lumion and they explained to me that it comes from the software used
For example sketchup (I don’t know how to use it yet) but I understood that this software allows components and to apply the glass texture to all windows, doors, walls
The color applied to the different faces also makes it possible to be understood as groups of textures which is apparently very simple and quick in Lumion
Can you help me understand what would be the best export and group technique to use in shapr3D to be effective

Thank you