How do you evoke in a lucid dream
Chanting should be more than enough since you wont bump into any problems like one does in physical world,also you cam create the sigil of the entity 3d you want to evoke.
Same way as in real life. Only now it’s way easier.
Actually you can even just call that spiritual entity’s name and she or he will show up especially if you already have a pact with that entity.