I don’t think so. The text is a pane of the main window and not a window in its own right. It is the case that the View menu controls the zoom in the (left side) view pane, including responding to pinch gestures. I think that difference derives form the pre-v6 architecture. What goes in the left pane were then called main views and had their own zoom controls, and I believe the current View menu are their descendants.
Again, in the past there was a mechanism to scale text windows, what is now the right-pane content. However, I believe that mechanism didn’t migrate to the v6+ UI, although over time (perhaps reflecting screen size/res changes) default $TextFontSize has migrated from 10pt to a current 16pt.
I know MB is on the road this week - I’d suggest emailing support so you can get a firmer fix on this and discuss your needs (i.e. a possible feature request).