Yeah! UPSC now offers the options in which you can write the GS papers in English and the optional papers as well as the essay paper in Hindi. So no need to worry about this. Also if you want you can choose your interview medium in Hindi even if you have given the Mains in English. But for the interview the reverse isn't applicable.

To know more about UPSC CSE visit the link provided below:

https://competition.careers360.com/exams/upsc-civil-services-exam

I hope my answer helps. All the very best for your future endeavors!