In cases where tabular results contain UCDs (i.e., when they arrived as VOTables, and there are actually UCDs included), Firefly dialogs that allow for review of available table columns should display a "UCD" column.
Specifically, the table viewer's "gears" dialog (used, among other things, to control column visibility), and the chart-options dialog's "column-picker" sub-dialog, should show UCDs when available. The latter, in particular, can really help users narrow down which columns they want out of a potentially large result set (WISE and Rubin object tables have hundreds of columns).
While working on this, please also harmonize the typography for the column headers (e.g., "units" vs. "Unit") between these dialogs. (I like "units" but you can ask the CCB-D.)
The attached VOTable header snapshot shows that the query result did have (minimal) UCDs - note that we are constantly adding more to DP0.2, though.