Scientist Control on Cargo Ship

Is there a way to control whether or not scientists exist on the cargo ship?

I see you can control the junkpile and military tunnel counts, but don't see a command for the cargo ship.

ai.npc_max_junkpile_count
ai.npc_max_population_military_tunnels

ai.npc_spawn_on_cargo_ship Spawn NPCs on the Cargo Ship. (default: true) (True)
In response to chadomat ():
ai.npc_spawn_on_cargo_ship Spawn NPCs on the Cargo Ship. (default: true) (True)
Thank you!

Is there a command that controls the quantity?