In SASS, is there a way to declare refer to the subclass of the block's parent?

Question

I am looking for a way to refer to a certain subclass of the parent of the block i am currently writing declarations in.

Let me illustrate.

Instead of:

.label {
    @extend .not-selectable;
    display: inline-block;
    line-height: 22px;
}

And then:

&.active .label {
    background-color: #eee;
}

I'd like to write something like:

.label {
    @extend .not-selectable;
    display: inline-block;
    line-height: 22px;
    << &.active {
        background-color: #eee;
    }
}

With the resulting, compiled CSS being exactly the same in both cases.

Is there any such syntax or hack or trick in SASS to achieve this?