Region type for the VSE? (keymap)

I would like to add some custom shortcuts and Pie menu to the VSE but I don’t succeed to add this while the mouse is over the preview area.

km = kc.keymaps.new(name=“Sequencer”, space_type=“SEQUENCE_EDITOR”, region_type=“PREVIEW”)
doen’t work and region_type=“WINDOW” works but only over the “strips” area. I would like to get it also in the preview.

How this is possible?

Thank you! :slight_smile: