how to give a default value to ag-grid filter

Trying to display a default value in ag-grid filter text . In filter param I want to give a default value to be displayed to user not only to be applied on the result

this.columnDefs = [
{
headerName: this.pageData["tbm.line.list.grid.phonenumber"],
field: 'tn',
/*sort: "asc",*/
sortable: true,
filter: "agTextColumnFilter",
filterParams: { filterOptions: ['contains'], apply: true },
//tooltip: (params) => 'Address: ' + params.value,
headerTooltip: 'Phone Number',
// editable: true,
// checkboxSelection: true,
// headerCheckboxSelection: true,
// headerCheckboxSelectionFilteredOnly: true,
width: 150
},

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