Merlin 1-D Smoke effect

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Some engines have an on-ground smoke effect, but the Merlin doesn't seem to have one. Considering that it's an engine often used for reusable boosters, a smoke effect would look especially great during landings.

Is there any chance this might be added in a future update? Or is it possible to add it through a patch, maybe by copying and scaling the effect from another engine that already has one?

Thanks a lot!