Show options for each cell of a specific column in script report

Hello to all users.
I have made a script report “Telle Caller Event Wise”,using from Telle-Caller Data , it has child table columns: call_status(Called , Not Called, etc), notes, mobile_number,student_name, while for parent doctype columns are: date, event_name, name(id).

I want to show options(select) in each cell under call_status column.
Notes and Call Status are the fields of child Table “Student Event Attendance”

Also i want to save changes directly to the database for call_status and notes(small text).

Please do share your reviews and solutions.
Thank You.