As an AI text-based model, I can provide you with a basic structure for a text-based game that resembles a GTA-like experience. However, note that implementing the entire game would be quite complex and not feasible within the constraints of a single HTML file.
Here's a simplified example of how you could structure your game using JavaScript in an HTML file:
Remember that this is just a basic structure and a starting point. You would need to implement the actual game mechanics, graphics, and more advanced functionalities to create a full-fledged game like GTA6.