multiple automatic outline

I have 40 objects ( for example cubes, spheres, and cylinders) but I would like to “enable outline” only for the “cube family” and on a “single object” of the family at the time (not all).
So I need to create, I think, a list of cube objects at the beginning of the experience.
I studied a little the lists but I found problems in creating them runtime ( that’s why I opened another post here)

I don’t want a “group” but a “list” because I need to use it with, for example, loops, if statements, add/remove items, etc…

Yuri Kovelenov wrote:

you can also create groups (collections) in the 3d modeling tool and use the group selector puzzle with outline

This will not work because I don’t want to “enable” all objects of the list but only “one object at the time” by mouse over, inside that list. I have 23 objects but I would like to enable outline only for 12 objects of a specific LIST.
That’s why I ask, in the other post here if there is an automatic way to create my list at the beginning of the app.