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For direct numeric entry in the color picker ? - No
With the spectrophotometer, photoshop indicates these decimal values. But to insert directly, only accepts integers.
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Photoshop calculates with higher precision, and stores values in the image according to the bit depth you set 8/16/32. But for keyboard entry - integers only
You can indirectly get a real number by changing the 8-bit RGB fields in the color picker. So both RGB 129|129|129 and 127|127|127 show as Lab 54|0|0, but when the color gets applied the Info panel set to 32-bit shows the Lab real numbers not the rounded color picker number:
And you could use a color sample point to see a subsequent curve adjustment in real numbers: