Pathfinder Archetype Swordmaster adding a info box to output for # of trances?

Tengu <meister-proper@...>

Hi all,

when using Pathfinder Archetype Swordmaster there is a class feature called "trances" which is available a limited number of times per day.
Often these features are displayed on the first page of the output sheets with tick boxes and explanation.
For trances that is not the case.
How could I mod the feature to display an info box on the first page of an output sheet? I do not know the tags/mechanic for this.