How do you display a selected object from the modeling viewport into grasshopper as a node?

let’s say I do want this curve to be displayed in the grasshopper viewport, how can I do that?

Start by drawing a sketch object using the pencil next to the eye.
Afterwards right click the sketch object and select load from Rhino.

… as a node on the GH canvas:

Drag a Curve component from the Geometry tab onto the canvas, right click, Set one Curve