I have found a Wither Storm addon : r/BedrockAddons

Chinese Crackers' Wither Storm Addon! MCPE/MCBE Minecraft Mod

Wither Storm Mod for Minecraft - APK Download for Android

Pocket Edition Wither Storm Mod - Minecraft Mods - Micdoodle8

WITHER STORM Minecraft PE Mods & Addons

cracker's wither storm mod and distant horizons = this : r/Minecraft

Download Crackers Wither Storm Mod MCPE android on PC

Wither Storm Addon - Minecraft Education Edition

Progress on my Wither Storm addon. I can't get the other two heads to mount the body for some reason. (explanation in comments.) : r/MinecraftCommands

New Wither Storm Mod Is Coming

30CM Wither Storm Mod Plush Toy Minecraft:Story Stuffed Christmas Birthday Gift