Currently there is a shortcut to invert your selection:

cmd / ctrl + shift + a

However it selects everything not selected on the canvas, even if I am currently within the context of a group. Most of the them I personally only want to have the selection within my group, not the entire page:

e.g. I am renaming variants within a component group: I selected every component I want to give property A to, now I want to select all the other components

It would be nice if either this behaviour was altered or a new shotcut combination (e.g. cmd / ctrl + alt + shit + a) was added to make this possible.