Specific instance when making a new type?

Hi, I’m new to the type feature and I was making a category class where you could select different categories in ui like this:

This is the class I have:

export type category = {
	Name: string,
	Opens: Instance,--Frame
	Button: Instance--Button
}

I want to be able to specify what kind of instances these are though. For example, instead of putting

Button: Instance

is there a way to put it like

Button: Button

Thanks!