this is the inside of the skin of your front bar - there is a pop out section for the fairlead.
The second picture is of the remains of the inner steel tray that was cut up to extract the crush tubes to transfer to the ARB bull bar. I don't reckon that you could mount a winch without an additional cradle
So my suggestion is that yes, you need a cradle to fit a winch to the factory steel bar.
edit - link to Mopar winch cradle but there seem to be a few aftermarket ones as well
https://www.allmoparparts.com/sku/82215182ac.html
Regards,
Tote