reference other mods' mobs + specific mobs in a radius

For Forge 1.20.2

I am trying to create an item that when held, inflicts specific nearby mobs with a potion effect.

I was wondering if it is possible to specify mobs from other mods to be affected by it.


Additionally, if it is possible to inflict all of a specific mob in a radius around you, rather than just the closest one, that would be helpful to know too.

Thank you.