Getting back to this topic.
I looked at it foor like 1 minutes for you, it may be in freemode.c :
https://github.com/Sainan/GTA-V-Decompiled-Scripts/blob/master/decompiled_scripts/freemode.c#L727630
Search for SHOOT_SINGLE_BULLET_BETWEEN_COORDS (which may be the good native for creating the bombs, Idk it could be something else).
The code at the line 727630 could be for planes or who knows what, but you can look at how it is done to remake it yourself.
You could also directly take a look at Vespura’s code for planes and adapt it for cars.