Add Spawns if Structure is placed?

Hey guys does someone know how to add a graph for:

If structure is placed add Dino XXX to Spawnentrie ?

I can spawn the XXX Dino in a location or radius at the structure but we want to add this dino to a SpawnEntrie of the map.

i would reach out the the ppl that made the dragon lords mod. they have “place this item before world spawns can happen” situation.