How to hide quality icon on hidden entities

[Pikachar]

Hello!
In a mod I'm working on I've got hidden entities that facilitate some logic, but the player should not really know that they are there. They're supposed to be hidden after all. Is there a way to specifically hide the quality icon on such an entity? And if so, what is the proper way of doing that? I saw that somebody had asked that question before, but the link directed me to a post that was deleted.

I've tried setting hidden = true, but that does not seem to do anything. And I'm not seeing any other property in the LuaEntityPrototype that I could set to achieve this result.

Any help is much appreciated!