I am just wondering if at some point will we have trim chrome or even plastic?
What do you mean exactly?
If you want strips of chrome to apply to your car, Pyrlix made chrome/plastic stripes, available in his modding thread:
Additionally, some car bodies do come with the option of having chrome bumpers/trim (the pre-wedge era supercar body, the not-Datsun berlinetta coupe body to name two). Not all of them do, though.
The nice thing about pyrlix’s trim strips (they are designated “vents” for now), is that they have different heights too, so you can do more refined detail work.