Haste answered that question on the same page with
You can do it with self:CustomDelayText() and self:CustomTimeText()
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and an example was given a few pages down
Code:
self.Castbar.CustomTimeText = function(self, duration)
if self.casting then
self.Time:SetFormattedText("%.1f", self.max - duration)
elseif self.channeling then
self.Time:SetFormattedText("%.1f", duration)
end
end