Hammer gta v out of the window's car

hi everyone! i’m writing this topic because i’m searching a method to use the hammer out of the car window, because i want to use a traffic paddle of the italian police, but it replace the hammer of the gta v story, but the hammer can be used only by feet and by motorcycle and not by car, anyone that know a method to unlock this function if we can call it like this.

sorry for english i’m a pizza boyy!!