You cannot simply drag a JAR file into a converter and get an MCADDON file out the other side. This is because you are attempting to translate a programming language (Java) into a completely different system (JSON/Molang).
file is primarily a texture pack (resource pack), you can use automated web tools to convert the assets. Extract the JAR : Rename your and extract its contents. Use a Converter how to convert jar to mcaddon
"type": "data", "uuid": "generate-another-uuid", "version": [1, 0, 0] You cannot simply drag a JAR file into