Often, when you find a woodland mansion in the forest, it stays empty due to a lack of friendly NPCs. But if there is a village nearby, you could always bring them there and fill the empty spaces.
In this Minecraft seed, you will find such a woodland mansion at coordinates -500, -750. It stands near two villages at coordinates -250, -750 and 100, -800, respectively
For more Minecraft 1.15 seeds, check out the list below: