USER STORY
I'm a gamer who has visual impairments - not severe enough to prevent me from playing, but enough that it can make spotting resources difficult.
Having some way to highlight sources of previously scanned resources via the PEEP.R would make it much easier for me to find those resources, especially in cluttered / busy environments, without having the additional UII clutter of an always-on resource scanner overlay.
While this is different from the resource scanner mechanic currently in the game, the map scanner does not aid in distinguishing, say, a dandelion stem in the middle of a field of grass stems, which can be frustrating.
Since outline highlighting is used in other contexts in the game, this could be used for the visual part with minimal changes; to avoid confusion with scanning creatures, though, a different colour should be used as users might want to locate insect parts (e.g., Ladybug Chunks)
WORKAROUND
The resource scanner option on the map can help narrow down the location of resources in the game space, but is not useful for finding the actual interactable item(s) in the game space; as such it is only a partial solution to the issue.
ADDITIONAL CONSIDERATIONS
As this is an accessibility request, I would argue that it should NOT be locked to the Resource Scanner mechanic; however, I acknowledge that using the Resource Scanner item selection UI would be the most straightforward way of implementing this functionality.
I would also suggest making it a toggle under Accessibility Options in the menu, possibly with a colour selection option for e.g. colour-blindness or just user preference.