Can't convert a axis label with callback function (:

[balamurugan-tealvue]

const valueFormatter = async(value: string) => {
return (Number(value)/1000000)+'Cr';
}

xAxis: {
type: 'category',
boundaryGap: false,
data: chartData?.equity_data?.map((data: any) => moment(data[1])?.format('HH:mm')),
axisLabel: {
formatter: valueFormatter ,
},
},