How can I use Ag-grid property tooltipField?

I am stuck when I using ag-grid with tooltipField property. I want to implement tooltip within ag-grid each row.

code is below. this code doesn't work.

{
headerName: 'vital',
field: 'indicator',
tooltipField: 'indicator',
cellRenderer: (p: any) => {
return '<div align="center"><button class="btn btn-sm btn-primary" tooltip="'
+ this.translateService.instant(p.value)
+ '"></button></div>';
}
}

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