Dynamically spawn enemy AI in blueprint

I’m currently making an endless runner type game. Tiles spawn randomly once the player starts, so initially there is nothing in the world. I want some tiles to have enemy AI on them, and each tile is stored in a separate blueprint. How do I go about setting up a Nav Mesh in the blueprint so that when the player gets close to the enemy, they move towards the player? Just simple zombie move-to-location.

Thank you!