Pixel phones: good Google Camera app algorithm and LineageOS support

Pixel phones (both older Qualcomm and newer Google Tensor) are known for very good camera algorithm. What I have heard the camera chipset (hardware) is similar to other phones, but the algorithm is what makes quite significant difference. Which part of the software stack is doing that algorithms? Is it only [Pixel Camera app](https://play.google.com/store/apps/details?id=com.google.android.GoogleCamera) or is there some other firmware? I'm asking if I reinstall stock Android with [LineageOS](https://lineageos.org/) whether I loose this functionality. Also, I suppose Pixel Camera app is installable on LineageOS. I'm asking specifically about Google Pixel 5 (redfin) and 6 (oriole), but it can be considered as a general question about all Pixel phones. I also suppose this is the only functionality I could use when migrating to LineageOS (I've had good experience with LineageOS support on other phones).