We added preview scales in our 2.7.0 release. (Release history) You add the item  object inside scale-x  to trigger this.

scaleX: {
  zooming: true,
  transform : {
    type : 'date',
    item : {
      visible : true    
    }
  }
},

Example: https://demos.zingchart.com/view/51WRPQ6Y

Note: Depending on chart size this feature may not be useful as it may offer too small to show anything of value to the user.  Use your judgement when adding such features to your chart.

Documentation

zooming tutorial
scale-x JSON pages
transform JSON pages
transform.item JSON pages

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