While this can somewhat be customized, the downside is that it will affect the Section Flag and Section Double callouts.

I pulled the LAFX-SECTION block into the block editor, deleted one of the attributes and the middle line, and made the single attribute twice as large.  Then when placing the Section Flag callout, it still prompted for both values, but had the desired look.

The downside of doing this, is that the Section bubble block has been altered to only one attribute, and will no longer work for its intended purpose.

The other way to accomplish this, would be to just place both callouts and then replace the Section bubble with the Viewpoint bubble.  But the Viewpoint one is a little smaller, so that requires increasing the size of both the viewpoint bubble and the View-Arrow blocks (or simply making a copy of the the Section-Arrow to overwrite View-Arrow).

--J

Thanks Jeremiah.  I'd been going the route of your second suggestion--placing both callouts, replacing Section bubble with Viewpoint bubble, and then slightly resizing arrows.  This is really pretty quick and easy on my end.  I was just checking to see if I was overlooking some simple way for me to customize this on my end.  I appreciate the tips.