I'm unfamiliar with what you mean by vector graphics elements. Fidget doesn't support vector graphic elements to my knowledge.
Maybe convert them to bitmaps and use the image/background for a node?
Yes fidget only support images. In figma use export as PNG and use the PNG of your vector element in fidget.
Before the plugin was made layoutAlign did not have "Inherit". They have sense added it.
Just delete those lines with layoutAlign: laInherit and it should continue to work.