New mob (Piranha for shark)

What do you want to be done?

Add new mob (Piranhas, Sharks)
In minecraft there are a variety of hostile creatures in the water, I would like them to add a little more difficulty when someone gets into the water, I would like them to add a new mob this could be a shark or piranhas, in case They were piranhas they could only be found in swamp or jungle biomes (It does not necessarily have to be in these biomes), these would be made up of groups of 3 fish could be more or less that depends on you, since piranhas attack in groups, When entering the water they would attack you, to satisfy their hunger they could release raw meat to the water and if they would become hostile for a few seconds or minutes, I think this would add a little more difficulty and fear when entering a certain biome .

Why do you want something done?

To add a little more difficulty to the game, it would also be quite good piranhas in swamps, this would add fear when getting into the swamp, as well as non-hostile fish are needed in the game.

How do you want something to be done?

They could place groups of piranhas in swamps, whether they are groups of 3 or more, they need non-hostile fish, they could add sharks or piranhas, I like piranhas and it is a good way to get them into the game, these could be caught in water boats These would act aggressively when any player got into the water.