How do I display simple row number for each row in quicksight pivot table visual?

Hello @HenryQS - Welcome to the Community! Thanks for posting your query. There’s no out of the box way to do this in QuickSight. I believe, when you say that you would like to add row number in pivot table as rows that means it has to be a dimension and can’t have custom aggregate levels. However, please take a look at the following link and see if this helps! Thankyou!