Moving selection in both directions (head / anchor) using built-in commands

By using selectSubwordBackward / selectSubwordForward commands selection’s head position has been moved.

It totally makes sense, but I wonder: is there a way to move anchor instead, so user can extend selection in both directions?

You could write your own commands that do this, but it’s not a common thing for text editors to support, so there are no commands for it in @codemirror/commands.