Modify your current timetable data directly in JSON format below.
JSON Structure Guide:
The JSON should have 'week1' and 'week2' arrays. Each array contains day objects.
A day object has a 'label' (e.g., "Day 1") and a 'periods' array.
Each period object needs: 'period' (e.g., "Period 1"), 'time' (e.g., "9:00 am"),
'subject', and 'room'.