On Sat, 7 Sep 2019 20:14:03 +0000, Mooch911
m wrote:

Can you ground the lamp to the inside of the metal lamp post using a screw.
Only black and white from the post. No ground. New lamp has a bare wire ground.
Thanks

You can do it if it makes you feel better but it doesn't accomplish
anything you are not getting from the mounting screws. There is
certainly no guarantee of clearing a fault with that wire.
Best advice, put it in a GFCI.