Yes! If I have a simple line, I can use the method you show. But as a relative novice, I expected to tap the ends of my arc with the measure tool. (parabolic nature, and not circular in nature) and get a length from one end to other.
selecting 2 points does not necessarily define one path because there can be other connected edges, arcs, lines, etc. but you can select all edges you’d like to know the length of and the app will calculate the total for you.