There is none on a stock XJ. Even if you would drill it. Too flimsy.
I had a custom winch type bumper made, but with no winch, instead it has hookups for my Roadmaster towbar to hook on. That has heavy metal extensions running back along the frame beside the motor. They must go back at least 18" and bolt up in multiple places.
The whole front is just basically sheet metal and will not hold up to pulling even a block or so. You need the tie-ins to the unibody frame area where front hitches, and winch bumpers bolt to.
2001 Sport - almost stock