How to create a bounding box (or any shape) programatically in .NET MAUI 7?

Question

Recently, I've read so many blogs but then there comes a newest official documentation on .NET MAUI's GraphicsView. This document changes a lot of approaches written earlier. I want to know that considering GraphicsView, how can I create a bounding box programmatically?

My scenario

I have got a picture (image) which is already loaded on a .NET MAUI app, I want to create N (where N is >= 1) rectangles on it based upon my logic and coordinates specific to that image. So basically a bounding box against each object inside an image.

Problem

I have got all the coordinates, logic etc. in place. It works fine in my UWP app (I know it's a legacy thing now, just wanted to test my logic) but now I want to create a shape programatically on that image and I can't find it how. The GraphicsView documentation doesn't explain this part. Although they did a great job in writing a shapes code but I want something paramaterised.