Bedrock does not allow you to inject code straight into the game engine like Forge or Fabric do. You cannot easily change core game physics or vanilla UI structures.
Rename the file extension from .jar to .zip (e.g., MyPack.jar becomes MyPack.zip ). Convert Jar To Mcaddon
Manually rearranging Java textures to match Bedrock's folder structure can take hours. Fortunately, you can automate this: Bedrock does not allow you to inject code