" The thing is I don't have any file of the mod that can be added but I am sure it is not a really big deal to create it."
If you're so sure that it's "not a really big deal" to create an animation, why don't you show us how easy it is?
There might be a similar animation in GTA SA we can use, you just need to start a local server and press F1 then go animations tab and look through them all there must be some throwing animations, the animation could be repeated like 10 times and each time the player gets rotated so money gets thrown all around them.
I've just added this but without the extra details that make adding it take multiple times longer.