Add arguments to provide explicit categorical axis order

It is unclear to me how to reorder a categorical axis in hvplot. For example, if I was to make a heatmap of 'Names' on a y-axis, 'Year' on the x-axis, and color would be 'Value', what if I want to a) sort by 'Names' reverse alphabetically or b) sort by the z value in a given year (i.e. highest to lowest z-value for Year 2. Are categorical always sorted by ascending alphabetical?