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To my knowledge there is no easy way to migrate from Photos to LR.
By default Photos places the image you import into it in a Package Folder that looks like a File until you right click on it and select "Show Package Contents". Then it will expand into many other folders. Look for one called Masters. In there you will find many other folders usually with dates as their names. In those you will find all your image files.
Adobe did at one time supply a plugin to migrate from Apple iPhoto and Apple Aperture. But as far as I know that doesn't work with Photos.