As far as I'm aware, no. I've wanted that pretty much ever since I started getting FFPs but it's never been an option on the West Coast for whatever reason.
That said, if you go enough that your pass is already paying for itself after 2 or 3 trips, you can upgrade for the individual night and they'll consider your pass a general ticket for the night, meaning they deduct the cost of the general ticket from the express ticket so you're getting a significant discount since the general ticket is technically free for you.
Obviously that isn't viable for every night you'd potentially wanna go since thats still 50-100 dollars a night, but I did it for unlimited express on my final night last year and did not regret the discounted extra charge for it.