When I was reading brotherhood (which I haven’t finished yet) I realised a cameo it was also very obvious so if you read it you might have noticed it as well. The cameo is Cal Kestis and his former master Jaro Tapal.
In the sentence along the lines of “Soon Anakin turned to Jedi master Jaro Tapal and his red haired apprentice behind him. This comes from the video game Jedi Fallen Order which is getting a sequel titled Jedi Survivor next year.
This ties into what Kathleen Kennedy said a few weeks ago about video games being a big inspiration towards SW story telling. I personally like that they’re doing this and can’t wait to see more tie ins in the future.