How to add some new E-commerce holidays for one country

I am a beginner in using Prophet. We are using Prophet to forecast an e-commerce project. Since there are many new e-commerce holidays, I want to add some new e-commerce holidays from 2015 to 2033 to the list. However, the specific holidays vary each year, but the difference is not significant. How should I modify the holiday list? I usually use R, but I am also familiar with Python. Please provide methods for both versions. Additionally, how should I handle holidays in the list that last for 5 days?

Thank you.