Hi.
Here's the link for the module I used.
https://forum.xda-developers.com/apps/magisk/module-camera2api-enabler-t3656651
And here's the link for the Apk for your choice. I used Arnova's 5.1.014_v11.1 (oreo) and works fine.
https://www.celsoazevedo.com/files/android/google-camera/
Good luck.