In order to configure different public holidays for your employees, you should create different holiday calendars. Go to Configuration → Holidays and choose Add calendar or Edit:
The next step is to add holidays to each calendar. For this purpose, next to the selected calendar, select the "+" icon, which will allow you to add holidays individually or import them collectively from the list suggested by Google:
When importing in bulk, select the appropriate year and mark only those days that are to be holidays, save the changes:
For each country, you need to add a new holiday calendar. Then you will be able to assign a calendar to an employee from the Holidays tab or employee profile.