AR to display UI at temporary placement position

I have a project where a 3D model is generated when the screen is tapped. I would like to temporarily display the UI in the expected generated position before tapping the screen.
The camera is always moving, and the UI at the generated location will move accordingly.

You can reference the sample project below, this project template demonstrates how to implement a simple call to action/link using CSS2D Renderer. This project can also be useful for labeling items in your 3D scene.:

You can also add an if you are using A-frame if you want UI or text in the actual scene itself.

I have attached the project for your reference.
I would like to implement a marker that appears at the start of the game at the position where the AR appears.
Also, is there a solution for implementing this in playcanvas?