I hope that there is an answer...
I've noticed that there is no way to put gradient fill simply from saving to GDL.
Pity. I prepare furniture library for interior designers - it will be nice to made their 2d symbols more graphic.
MacBook Pro Retina 2019/2.4 GHz/Intel Core i9/32GB RAM/Radeon Pro 5500M 4GB/macOS 11.6/ArchiCAD 25vINT+POL/Maxwell Render 5.2/Twinmotion 2022.1