In a DataView where, say, there is a row for each County (as identified in Layout as an Axes, by row) - there does not appear to be a way of emboldening the axes column heading?
Layout data blocks column headings are formatted through Layout\Data\Block\Format. However, Axis entities are not used in blocks, so this option is not available. DataView Settings Header Foreground setting only offers choice of colour, not emboldening/italicising.
Next release ?