Right-click on your .jar file, select "Rename," and change the extension from .jar to .zip . On some systems, you might need to enable the viewing of file extensions to do this.
However, you can the functionality of a JAR mod as a portable MCADDON (Add-on) file. This process involves converting textures, modeling, and rewriting behavior logic from Java to Bedrock’s JSON-based system. Prerequisites: Tools You'll Need how to convert jar to mcaddon portable
I can then give you the specific you'll need for your .mcaddon . Right-click on your
"pack": "description": "My Addon Pack", "pack_format": 1 Right-click on your .jar file