getting spawn eggs in survival

Unlike what many people say you could get, I think this valuable item should be obtained in a hard to find structure located on the plateau, in a new structure that would have chests and would be defended by several mobs, in the main chest there would be a new item called empty spawn egg, then, you just need to click on the mob you want and you will get its egg, this would only be possible with certain animals and mobs so as not to unbalance the game.