It's not really a 108mp camera. It's a 27mp camera with a quad-bayer sensor. Some software/firmware magic might output a file at higher resolution, but it can't really capture that level of detail.
You should look for custom ROMs that incorporate the official camera app. It's been a while since I dabbled with custom ROMs but there's always a few makers that'd do so.
It might be possible to extract their official camera apk and install it on the custom ROM. Hopefully it doesn't depend on their system services being available.
The camera being on the Play Store is a big reason I chose a Pixel. It's simple to install it on GrapheneOS and remove all network permissions.
Samsungs camera needs many dependency "services" apps. Dont know about Xiaomi
My phone is advertised as 48MP. OpenCamera (and the official app) used to output 8000x6000. I installed LineageOS on it and now the best it can do is 4000x3000.
I'm not even mad that it's lower, just that they tried to tell me it wasn't. I always thought the details zoomed in were a garbled mess anyway...
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