If you want to reference the images to Lightroom from Photos, it won't be possible as Lightroom checks the location of the images on the hard drive and then adds them to catalog for editing.
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Your images can be stored anywhere, in any folder, on any hard drive that is connected to your computer. If you don't want to move them out of the Photos folder that's fine. But there's no need to be nervous about it. There's nothing magical about the Photos folder. It's just a folder on your computer. However, once you have put them in a folder (regardless of where it is located) it's probably best not to move it because Lightroom will lose its reference to the images. It's easy to fix that. But until you understand Lightroom a little bit more it's probably not a good idea.