Refinement of AR Implementation in Flutter App

We are developing an exclusive iOS application built with Flutter. The core feature revolves around displaying 3D objects (spheres) in real space based on specific geographic coordinates (Latitude & Longitude)... (Budget: $30 - $250 USD, Jobs: 3D Modelling, 3D Rendering, AR / VR 3D Asset, ARKit, Flutter, Geospatial, iPhone, Mobile App Development, Objective C, Unity 3D)