Desataurate jpeg

You should be able to open the jpeg in camera raw and use the same tools.
 
Quick tip:
Ctrl+Shift+U - desaturate
Ctrl+Z - undo.
You're welcome :)
 
A couple of ways to do this, add a saturation/vibrance adjustment layer, this will then allow non-destructive desaturation, you could also convert to a smart object to then apply a filter which you can then go back and remove
 
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