This seems to still be something many people want, and it wouldn't be a bad thing to add. I currently have to export my pictures to another program, (Lightroom classic cc) add the watermark, and then re-import them into Lightroom CC. I use Lightroom's photo sharing service on my website to display my pictures, so the final photo has to be in Lightroom CC for upload. I would just like to not have to jump between programs to simply add text to the bottom of my picture. Especially if Lightroom CC on my phone can export with watermark, why can't Lightroom CC for desktop.