Glass effect does not export to Flutter

Our designer used the glass effect

Great - except Figma doesn’t export it. On export in either CSS or flutter, the effects just disappear. 

I tried exporting the buttons as images, which is already kind of bad, but it doesn’t work, background blend effects get exported with the image, and I can’t reuse it across different screens. It’s tied to its background. 

How are we supposed to use Glass when it can’t be exported? It’s kind of totally pointless, no?