There are several ways to approach this, one way is to specify separate series text and legend item text using the text and legendText attributes, respectively, in the individual series objects. See the below chart.

Example: https://demos.zingchart.com/view/RP9NJ9J5

Another way is to set the maximum number of characters you want displayed by adding a maxChars attribute to the item object in your legend. You can also add legend tooltips with the tooltip object to display the full series name when users hover over the legend items. See the below chart.

Example: https://demos.zingchart.com/view/FZMXSQFO

Documentation

Legend Tutorial

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