LTZ with no wireless charger seems weird , but you are not missing anything ,if you use android auto or car play it has to be plugged in anyway, the stock coil on mine is useless for the galaxy phone line. Coil is too far back for this very popular phone .and it is a single coil charger which are slower than an aftermarket ! I really think there is a simple fix but GM missed the mark , maybe other phones work but mine does not , haven't tried my wife's phone yet, ! You would think after all the complaints they would change it , ! but it is a great truck
I had a 2018 Yukon loaner and it has the same problem with wireless charging a samsung galaxy ,I don't use a case , even though the phone is like holding on to a chunk of slippery ice
I would think calling salvage yards and try to find one out of a new lid salvage yard you may get lucky but u may lose a port under the lid because yours probably doesn't have the harness,