Digital crop focal length options in natural processing

I’d like to be able to select different focal lengths in natural processing even if it’s just a digital crop. I’d like the crop to be present in the viewfinder as well as the saved photo, and to be able to be set and stay until I change it. I care more about removing the phone photo look and getting the composition right than I do about the final megapixels. I hope this is something you’d consider adding! :)