You initially said "If I use TomTom maps, it shows junction view for every highway exit" Which indicates that you must use .fjw/.fjv It is NOT possible to see junction view without .fjw/.fjv Post screenshot of your TomTom junction view. Just arrows is NOT junction view, it's lane guidance. Lane guidance is part of map so TomTom and HERE could show differently*. The newer vector graphics comes from .fjw
Garmin is NOT NNG, they don't make nor use same data.
* TomTom map data is from formally TeleAtlas while HERE map data is from formally Navteq
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