The one that I can think are
1-“they(emperor & ochi)/he(ochi) discovered Rey’s existence”.
2-“The dagger reveal Rey’s existence”.
3-“He(ochi) received visions of Rey”.
4-“he(ochi)received visions from the dagger”
5-“someone tell them(emperor & ochi)/him(ochi) about Rey”.
6-"a hired spy tell them(emperor & ochi)/him(ochi) about Rey.

Maybe you can get a better ideas from the one I suggested above.its hard because I don’t know if the dialogues can fit the duration of the scene.