That's a meta warning. It appears outside of the description, so that you do not even reach the game's description. It is also used for filtering.
Meta warnings and filters for the things you described are non practical.
Just write the warnings in your game's description and at the start screen of your game. These things belong in a disclaimer. You would need an epilepsy warning in the game and not only at a place where you downloaded the game.
And some things are just tags and not warnings. You can warn a player about the ducks in your game for comedy effect of course.
https://itch.io/games/tag-difficult