How do i modify the creation of data graph model while using the Neo4j ETL Tool

I am importing data from My SQL to neo4j graph database using the ETL Tool present in the Neo4j Desktop.While doing so...4 of the tables that are present in my relational database have been converted to nodes.While the other 2 have been converted to relationships.Can i modify it such that one of the relationships gets converted into an entity node.

Neo4j version: 5.3.0

It uses a default model of turning join tables (tables with two foreign keys into relationships) currently those rules are hardcoded.

While you could modify the mapping-json manually, it might be easier to output your relational data as CSV and use the data-importer.neo4j.io to import and model the data.

You can see the mapping json location in the log outputs.

Could you please explain more on modifying the mapping-json manually?