echarts: How to use only one of dataZoom's zoom and back

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I want to use only one dataZoom.

how to use that?

When operated with show's boolean, both icons appear or both disappear.

I want to use only one of dataZoom's zoom and back....

Sorry if my question is weird or unclear.

toolbox:{

    feature: {
        dataZoom: {
              title: {
              zoom: "" //i don't wanna use that(zoom) 
              back: "Zoom Out" //i wanna use back.
              },
      },
    }

}
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