I want to say something like
Being interested in politics, I have pursued my passion for/in it by....
Under this context shall I use for or in?
I want to say something like
Being interested in politics, I have pursued my passion for/in it by....
Under this context shall I use for or in?
Passion in X would mean you are passionate about something within X. When you say this without further information, someone might follow up with the question, "What are you passionate about in politics?", for example.
If you are passionate about the entirety of X, then use for.