How would I get the x-axis value from a clicked point on a line?

[piersrr]

I've got a method outputting "params" from <v-chart @click='onClick'>, but I need to convert the params value from x and y position to the x-axis label value. In params output, I get:
componentIndex : 0 componentSubType : "line" componentType : "series" event : {type: 'click', event: PointerEvent, target: ECPolyline, topTarget: ECPolyline, cancelBubble: false, …} seriesIndex : 0 seriesName : "Line 1" seriesType : "line" type : "click"

The problem is seriesIndex is 0 wherever I click. There is no params.name. Any suggestions?