I like to do STORYBOARD Thumbnail Sketches in Goodnotes!!

I really like the PENCIL tool!
But often times I sketch in one colour ( light blue or red)
and then CLEAN UP the drawing in dark grey or black..

I would really like to:
- THEN ERASE THE LIGHT BLUE SKETCH underneath, only..
NOT my sketch above!!
Right now this is NOT possible, because we have an ERASE HIGHLIGHTER ONLY option , but the Highlighter is too BIG for sketching!!

Soo It would be indeed very helpful to HAVE a "colour-pick eraser.."

That way we could sketch in ONE colour, then INK in another colour above and later erase ONLY the UNDER LYING DRAWING!! That would be a GAME-CHANGER, for SKETCHING! I need to go to 3 different apps now for this only!

AND MAYBE add the SAME OPTION for the LASSO TOOL!
THAT way I could later colour Pick ONLY the BLUE COLOUR and CHANGE it to let's say GREEN or DARK BLUE or GREY, WITHOUT AFFECTING my SKETCH in BLACK ABOVE!

Thanks 👀👍🏻🙏🏻