Unfortunately, I don't think you can. The "BMW Individual high-gloss Shadow Line with extended contents" adds more black to the radiator grille frame, but as you say, it does not completely black out the grille; there is still an inner line of grey/silver on each side of the kidney grille. Can't even swap it out for a black 4 series grille - they are the same size, but a different construction.
On the left is the i4 M50 and on the right M440i Gran Coupe with the same "BMW Individual high-gloss Shadow Line with extended contents" selected on both.
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