So I am working on an AR app. I would like to know what is the best way to create a countdown app that shows numbers counting down to 0. Is there a specific package that I can use? Also how do I edit the properties of a 3d model in the app? I am currently using gltf models in the "ar_flutter_plugin" to use "numbered images" and then changing the images after every second. Is there a better way where I could draw out numbers?