Since you cannot convert the file directly, you must reverse-engineer the JAR and rebuild it as an MCADDON. Here is how the professionals do it.
Without a valid manifest.json , your MCADDON won't even appear in Minecraft. convert jar to mcaddon work
: The best environment for writing the necessary JSON and JavaScript for Bedrock addons. Since you cannot convert the file directly, you
For those who may not know, JAR (Java ARchive) is a file format used to package Java classes and other files. In the context of Minecraft modding, JAR files often contain mod code and resources. convert jar to mcaddon work
Written in Java, these modify the game's actual code using loaders like Forge or Fabric.