I see primer. You need to determine how the job was down. Are the stripes tape, or are they painted?
If it is not tape:
The black looks to me like it was painted 1st, then masked and painted white.
If it was tape and took up the white, then your going to have a “step” between the surfaces if you just cover it up.
Me- I would carefully mask the whole stripe and paint it entirely over with maybe SEM Trim Black. If the existing stripe is paint, you could lightly sand/feather edge the missing spot within the stripe. If the stripe is vinyl, remove that portion AFTER masking, feather edge the white, then paint. Several light coats.
If you cannot sand/feather you could try some kind of paint with a texture perhaps.
That’s my 2 cents.