No direct way currently, but sounds like a good feature request.
Does your tournament allow rebuys or add-ons? If you don't allow rebuys or you don't allow add-ons (or neither), you could use the <addontimeleft> or <rebuytimeleft> tokens. For example, turn on the setting to Allow Add-ons, set the last round for add-ons to be round 5. Then the <addontimeleft> token should display the amount of time remaining until round 5 is over.
If turning on add-ons makes the number of add-ons show up in the layout, you can always just remove that cell.