Add text to standard-format for e.g. "uptime" (instead of using placeholders)

[Deinorius]

Hi all,

I would like to have some extra text to uptime output. Using placeholders "{1} days, {2} hours, {3} mins on fire" works in general, but normally this format would display "1 day, 3 hours, 1 min" instead of "1 days, 3 hours, 1 mins on fire" in my case.

Is it possible to do something like "{uptime-format} on fire", which just adds text to the standard?