Lightroom mobile is capable of automatically importing photos taken on iPhone to the Lightroom library. For now, it imports all photos and does not provide any way to filter which photos to import.
When I want to process a photo, I take it in RAW, using Halide. I then process it in Lightroom.
And when I want to take a simple photo, I use the Photos app of Apple which is good enough in many situations.
I've currently disabled the automatic import because I'd like to have only RAW files in Lightroom, not JPEG/HEIF photos. I thus manually import the RAWs in Lightroom.
I'd like an option in Lightroom Mobile to import RAW files only, that would simplify my process.