SCSS extend a nested selector and override the nested rulesets

Question

Ok so I have a placeholder with a nested selector:

%block {
  .title {
    font-size:12px;
  }
}

I want to extend it and ADD to the .

Answer 1

LESS can do that. However you would write:

.superblock {
  .title {
    .block .title;
  }
}

Not sure if it works with @extend too.