ffmpeg make film look wet

How can I make something look like it's really wet?

I have a video of some food and I want to make it look shiny/moist/glistening.

Can ffmpeg do this?

I don't think iMovie can, I looked through all the video filters.

I looked at this ffmpeg documentation because it showed up for a google search with "wet" and "ffmpeg", but I don't know what "wet gain" is.