Hello @Nanjizal_net! Sorry I just got to this now.
Yes, Iron and Armory is running on the custom "arm" format to handle all the data. The reason for this is to make sure data are in the exact state needed. This ensures everything runs as fast as possible (and leaves the door open for more optimizations / features).
In Armory this does not matter since Blender imports most of the formats just fine and the conversion happens behind the scenes. For Iron alone it's a bit worse - you would have to manually export the data using the Blender exporter. I am thinking of building a tool to automate this. Connecting OBJ parser directly would also work, but is not yet implemented.
The SVG path sounds doable but quite tough I think. You would have to import SVG into Blender, convert that into Grease Pencil and finally export that into Iron using the arm format. Could be interesting though!