Now our Flutter open-source UI library is live check out our GitHub repo to use this https://github.com/ionicfirebaseapp/getflutter and let us know your feedback to us to make it a more perfect.
By the way could we add code snippets to the mobile app version
Check out readymade solution for Grocery store built with Flutter https://www.ionicfirebaseapp.com/products/readymade-grocery-online-store