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Once you change the pixels in an image, it is, by definition, no longer a raw image.  To preserve the integrity of the original image, for safety, Adobe has decided that no changes (such as sharpening the data) will ever be written back into any raw file.

That being said, since you are already using LR, you can effectively do the same thing by a very simple procedure in LR.  In the first step, you set the sharpening parameters for one image in your set.  You then synchronize just that one setting (sharpening) with all the other images in that set.  Now, when you view any of these images in LR, they will all be sharpened by the same amount.   The data in the raw files have not been changed (ie, sharpened), but the instructions for doing so in LR has been recorded and will be applied when the image is viewed or exported.

In the second step, while continuing to work in LR, you go over each of the images in the set, one-by-one, making other corrections/adjustments.  These instructions will be added to the instruction to sharpen each raw image, so that when you view or export any of them, you will see what you asked for: sharpening PLUS your other changes.

HTH,

Tom M