Depending on which version you are using there can be a few settings that influence how text is placed or justified within the Zone Stamp. For example, in AC19 there are some setting like this in the Appearance page of the Settings panel of the Zone Settings Dialog.
But generally they do not work like it works in AutoCAD.
Probably it would be possible to make the Zone Stamp text block width resizable, but that would require changing the script of the Zone Stamp in GDL.
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