Screen Cells not rendering item value according to unit

I have an item with unit set to uptime.

Obviously on Monitoring->Latest Data the info is reported with proper format as: 92 days, 14:23:31

But, if I include the item as "Plain text" into a screen the info is displayed as "raw" data, eg 8000671.

I think either it should display in screen as 92 days, 14:23:31 format or we should have other Screen cell type (not Plain text) which will not just throw the raw data but rather the format specified into units.