What type of phone? With my iPhone I can get an SD card to Lightning adapter and which lets me import raw files into the phone's Photos app - from where LRCC can import them. It's indirect - you can't do it directly.
If you have an iPhone this will work. First import the images from the card to the Photos app. Then open Lightroom and import the photos from your camera roll. After the sync is complete you can delete the images from the camera roll.