Achieve a "stroke" / "transparent" effect with the Line Renderer in 2D

I would like to be able to draw lines that have "outlines" and do not have any color inside. When the lines overlap, the ones below need to be visible. I guess I am trying to achieve something like the "Stroke" effect in Photoshop with the Fill set to 0%. I am trying to achieve something like this:

Unity's Line Renderer doesn't seem to offer an obvious/easy way to do this. There doesn't seem to be a way to add a stroke/outline to a line. I am aware that I can have 2 Line Renderers on top of each other (one with a shorter width than the other) to achieve a "stroke" effect. However, this doesn't solve the "transparency" issue and I will just end up with something like this:

Is there a way to achieve such an effect?

Note: Keep in mind that the ends of the lines need to be rounded (I am currently using End Cap Vertices with the Line Renderer)