This is not possible. Addons cannot see or modify minimap tracking dots in any way.
You can change the yellow dot to something else by overriding the default texture file with a custom texture file -- for example, you could make it a blue star -- but the game uses the same texture for everything, so this would cause all tracking icons that were originally a yellow dot to show up as a blue star instead. If this is something you are interested in,
Blipstick provides several alternative blip sets to choose from, and will show you how to replace the textures.
You can also
add icons to the minimap showing which types of herbs or mines can spawn where, but these icons (a) cannot tell you whether a node is currently active, and (b) will appear on top of the actual tracking dots, hiding them. Addons like
GatherMate do this, and address (b) by changing the icons to a circle inside a certain distance so any actual tracking dots that may be shown are visible through them.