Ever Call Recorder is the best NON ROOT Open - Source Call recorder which uses Shizuku to record both side calls and gives you them as audio files

Note: Since this app requires Shizuku, the Shizuku service stops automatically in the Official Shizuku App. To prevent this happening, Uninstall the Original Shizuku and Install this Shizuku Fork (Click Here) and after installed, then run shizuku normally and make sure that you go to shizuku app, on the top right, click settings icon and click "Watchdog" which prevents Shizuku service from Stopping !!