Right now, the highlighter only makes a square box filled with color. Could you add a Pen markup with snapping and a Box markup that only highlights the edges?
Two customers requested this last week. 'Pen' mode for as built images for better collaboration from field to office. Freehand highlighter mode, easy to use from a mobile device.
Tip. *Click Default (upper right corner) to add a new layer. These layers clear the takeoff data from the new layer. Some customers are using this for takeoff by division others are using it as-built and to make notes of revisions by using a date as the name of the layer and noting the plan changes by layer.