Adding hover text (hover-help) to a form field that isn't an SBM field

I've got a form that has a label and field I've defined in Composer.  It's not a SBM "field" in the usual sense, i.e. it's not a field in the DB.  The field will be populated by JS.  I would like the label and field to behave similar to a "normal" SBM field, with pop-up hover-help appearing when the user hovers the mouse over the label.  Because the field is not in a field in the database, SBM doesn't provide the infrastructure to display the field's TS_DESCRIPTION as hover-help.

I'm trying to figure out how SBM does it so that I can just tap into the existing look-and-feel.  As near as I can tell, this is the code that's being called when a user hover's over a label.  It's in jquery-sbm.min.js

eventHandle = elemData.handle = function( e ) {                                   // Hover-help?

   // Discard the second event of a jQuery.event.trigger() and                    // Hover-help?
   // when an event is called after a page has unloaded                           // Hover-help?
   return typeof jQuery !== "undefined" && jQuery.event.triggered !== e.type ?    // Hover-help?
   jQuery.event.dispatch.apply( elem, arguments ) : undefined;                    // Hover-help?
};

I haven't gotten any further at this point.  Has anyone figured this out?

This is SBM 11.8.  We're working on upgrading to 12.something.