rambleon I did it!
Although it didn't let me install the stock GCam from APKpure, I was able to install the GCam port AGS (BigKaka developer). At least it has improved the image quality in low light conditions.
I'm open to any else developer with which the camera works well (pixel 6A) or XML files that I'd need to know about.
Thank you, the photographic section is important to me.