Fortunately, there an easy work-round with PhotoRaw - here's the step-by-step instructions:
- Install PhotoRaw on your iPad. Note that PhotoRaw Lite won't work for this.
- Import the raw files stored on your iPad into PhotoRaw.
- Batch export them - touch the batch button (the gears), select all the files, then touch the action button (the arrow), select JPEG quality, and touch save.
- Your images are now saved on the iPad as JPEG at full resolution, and can be imported into Lightroom Mobile just as you would any other JPEG