You need good glass for those 1000 yard crossbow shots? Just kidding, the Ravin X bows come with a Strike eagle on their higher end models. I don’t know if you’re wanting to drop serious coin on a NF, S&B, etc.... but and LPVO would do great on a Crossbow.
My wife uses the calibrated optic that came on her Ravin R9, it works like a charm to 100 yards and is deadly AF! It’s not great glass though, then again it doesn’t really need to be 100yds and in. My $.02