How to import using ETL tool a hierarchical database table


I have a tree structure maintained in a Mysql table in the following format.

Id | left_id | right_id

As evident from the simple form, this is a binary tree structure maintained in a relational table. At the time of querying, a CTE self-referential join is being run through this table to generate a tree. I am finding it difficult to import this into Neo4j as the ETL engine only lets you import tables based on constraint relationships with other tables. and recognizes the relationships only as constraint keys. Is there a way to do this import?