After killing tons of Barakoas or their sun chief, he will gain a status effect just like "Bad Omen" and when the player enters a village will result a raid.

But this is a pillager feature, not a Barakoa feature. It wouldn’t make sense to see Barakoa raiding a snowy village.

I suppose you want Piglin raids, too?

Pillager raids are already in the game. The Barakoa are different mobs and they do different things.