I think your phrase is perfect, though Alex has given alternates. One thing that I’m jealous of you for is your ability to relax under pressure. Pressure gets me so stressed out that I can’t eat or sleep.

Here’s an example: One thing I'm jealous about is your incredibly lavish lifestyle. I'm also jealous of your high status within society. I'm also jealous of your looks. In short, I’m jealous of everything about you. I'm jealous of the fact that other people are jealous about you.