Zone Stamp Vertical Text Interspace

[BJ1]

Hi all,

I would like to change the space beetween text lines in the Zone stamp. I need to do that because I want to save some space on my plan (overcrowded plan).
However, Archi Cad only offers values bigger or equal to zero and that is not enough. I need to make it really thight.

jpg. attached or just scroll down (in text)

Thank you all in advance!