Guidance on how to properly add modded mobs as captains?

[ih8eay-toska]

Hello, I'm currently playing on 1.20.1 Fabric mod loader and if possible, I would greatly appreciate it if you could perhaps guide me to add additional mobs into the possible spawn pool (?) of the captains. In this case, I would love it if the Mutant Monsters (by Fuzs on modrinth) could perhaps spawn as captains. Oh and I also have some questions regarding the option to perma enable the glow of captains on all worlds (in my case, every time I create a new world, I will have to manually enable it in the /function command). Thanks a lot for reading this.