Cocanuta

Hello, I'm currently adding custom villagers and villager houses to my mod. I've registered the villager profession and the village structure components successfully. The new building is showing up in villages as expected, and it's even spawning my custom profession within the generated building like I expected. My issue is that at least half of the vanilla villagers are also my custom villager. Is there any way to limit custom professions to only spawn when called by the spawnVillagers() function in the structure generation class? Thanks in advance for any assistance that can be given (first time poster, long time lurker).