It does exist, with bakkesmod. But you need to host the match. It's not possible to use it in online matches, you can only do it in a match that you host with bakkesmod rocket plug-in
I dont think this is the right topic, but its still related so i guess it wont be a problem. You install bakkesmod, the plugins you wanna add, hamachi and of course rocket league. You can find extra details on bakkesmods' website. There are mods like aimbot, missbot, jet fight and a lot of other stuff. You can also check out the Sunless Khan youtube channel with 2 mill subs. He makes videos about the mods and also other parts of rl