After much testing and tweeking, including the gcam versions given here, I have to say that my absolute best gcam version is Hasli.
Currently working with version Helena R6, link for download is here:
https://www.celsoazevedo.com/files/android/google-camera/dev-hasli/.
My very much tweaked config, latest version is shared here.
Every cam and many options are tweaked, including white balance, noise reduction, detail preservation etc.
I am still not 100% satisfied with white balance in all circumstances, but overall best so far.
White dots in ultrawide cam are somewhat corrected with luma noise reduction - much better but not gone.
The only problem I have with this version is with selfi cam - there is a color bleed between surfaces, see the example attached. But this is the problem I have with every gcam version 8 I have tried (version 7.3 does not have this issue). I cannot figure out how to fix it.
I hope someone else will test this cam and config
There are still many options I did not try and there is no good guide for this version, and no community to discuss problems and tweaks (the Telegram group I have has locked comments).
It is true - Motorola did not do the best job with this phone's camera and gcam cannot fix everything but I think this makes it usable.
Happy Holidays!
Milica