I see, unfortunately currently for Classic Service Management projects this is not possible to set as hardcoded.
There is an open Suggestion which you could vote for.
In case it gets a reasonable amount of votes the likeliness is then higher that the idea will be implemented.
For an exact status please refer to the Suggestion liked, as well.
Unfortunately I could not even find a workaround so it leaves us with waiting for progress on the Suggestion as it looks.
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