Dynamically getting the column headers of a table for a Pulldown

What is the best way to obtain a list of column headers for a Pulldown module in Sideview Utils?

I have a requirement to add a filter by the selected column for the dashboard users. They want to be able to select Column 1, and filter on anything containing A (for example), but they also want the ability to filter on Column 2, and filter on anything containing 123 (thankfully not at the same time). I have the search all set up, with a simple ... | where like($column$, "%$filter$%") to filter on, but I need to be able to have the Pulldown dynamically populated.

Thanks!