Anyone know how to get an Astros player to sign a card?

I managed to pull a SSP Yordan Alvarez card, and as a lifelong Astros fan, it is the best card I've ever gotten in a pack. Anyone know a way to reach out to the Astros to ask for a signature? It's for my personal collection and I'm definitely never going to be willing to sell or trade for anything else. Even if I never get it signed, it will be treasured just as much. Thanks in advance for any advice!!