Resource :: Regional Prompter
Regional Prompter allows you to segment the image into distinct regions.
Each of these regions can then be assigned a specific prompt, guiding the image generation process within that particular area.
It often fails, especially if you use different LoRAs for different regions, so be ready to multiply your number of generations.
This extension is hard to master and you will spend some hours only to understand the basics.
Link to Regional Prompter for A1111 (GitHub)
How to install/use
Everything you need to know is available on the GitHub page.
Stable Diffusion Art provides once again an extended and well written guide.
A short guide by RoiD1kan.
You can also ask Gemini.