@ozaaditya 
Thank you for your response
Am I correct in understanding that the Databricks cleanroom uses Delta Sharing as its foundation, so it does not natively support column-level masking and row-level security directly within the shared framework, as Delta Sharing does? I guess.

Here is the document I was looking at to ask my first question.

https://docs.databricks.com/ja/clean-rooms/index.html
https://www.databricks.com/blog/2022/06/28/introducing-data-cleanrooms-for-the-lakehouse.html