No, you swear an oath to answer honestly during the jury selection process. The lawyers will ask if you have any moral or ethical concerns that would prevent you from convicting the accused - ie you would be willing to engage in jury nullification. If you say no, but you actually do intend to nullify, then you lied under oath and could be found guilty of perjury at that point.
Wait. They have to swear an oath that they don’t know shit about the legal system?
No, you swear an oath to answer honestly during the jury selection process. The lawyers will ask if you have any moral or ethical concerns that would prevent you from convicting the accused - ie you would be willing to engage in jury nullification. If you say no, but you actually do intend to nullify, then you lied under oath and could be found guilty of perjury at that point.