Looks like they filmed a flashback scene of the Jedi that Jod talks about meeting briefly. But ultimately left it out, depriving us of a really hot female Jedi.
The directors explained to EW why they didn't keep it.
Ford: "The challenge though was, as fascinating as Jod is, we always wanted to keep it from the kids' perspective. The kids are like, 'I don't understand this guy.' They've never been out in the galaxy and met someone as damaged as him. So I don't think we could have done a flashback in this season."
Watts: "Yeah, not in this season. But what's great about
Star Wars is that you start talking about someone's backstory and there's already a history and allure that surrounds it. So you start getting excited about, 'Oh, well, where do you place this person if it's X amount of years ago into this larger galactic timeline?' It's just such a rich world that you can have so many variations and varieties of characters and backstories, and it's just like limitless potential. It's very fun."