Some nice responses out there..
Tried but unfortunately ready made color aren't available straightaway as its either pure white or off white same goes for blue and maroons. One needs to make his own color to closely resemble to the original color.
There are fixes but seems those products aren't available in India, unfortunately.
The sanding, primer etc. job is too pro for an average user so its best left with the garage.
Have witnessed people doing such Rnd from YT and ended up spoiling a major portion of the bumper. A small scratch costed them even more, eventually leading to paint the entire bumper.
There's something like a magic marker eraser, scratch seleant (matching color) etc. but not too common or hard to find here.
