And now I’ve been able to identify it: “wild comfrey” whose scientific name is Cynoglossum virginianum. How very exciting to realize I was on the right track by thinking it resembled the common comfrey (Symphytum officinale). Even though they are not in the same genus at all.
I did check on whether wild comfrey is a medicinal. The only reference I could find is that the Cherokee have had some medicinal uses for its roots.
For now, I delight in the successful adventure of finding, identifying and admiring this plant.