Im Facing the same issue.
I have a Table not ALV in WDA and I need to provide a tooltip for it based on row.
Please let me know how to bifurcate based on rows of the table as I am able to pop the same text for all the rows of the table currently.
referred incomplete solution from below link:
https://answers.sap.com/questions/34356/webdynpro--need-to-write-tooltip-on-table-cell.htm
Best Regards,
Rakshitha.S