While there *might* be a few very specific exceptions (like a suspension component in exceptionally harsh conditions), you should not be looking for grease fittings to lubricate your 2014 Impala. Attempting to grease something that's not designed for it could cause damage.
Your owner's manual is the best resource to confirm this and to understand the recommended maintenance schedule for your vehicle. If you have any concerns about lubrication or squeaks, consult a qualified mechanic.