How to modify field value of columnDefs in AgGridReact?

how to How to modify field value of columnDefs in AgGridReact?

I am using AgGridReact component, in the column Defs i want to change the value based on the status result

<AgGridReact

            rowData={rowData}
            columnDefs={this.state.columnDefs}

            pagination={true}
            onGridReady={this.onGridReady}
            enableSorting
            enableFilter>

        </AgGridReact>

In the columnDefs field status i want to change based on the status code in the image attached i have status 4 and 5 if the status is 4 i need to display as approve if the status code is 5 i need to display as rejected.

I need to modify the status code to respective status name, As i am receiving the response of the status as numbers according to numbers i need to convert to their respective status information like below

In the Aggrid table I need the status numbers to be converted to text according to their status codes please any one guide me doing this.

this.state = {
        columnDefs: [
            {
                headerName: "Client Name",
                field: "clientName",
                width: 250
            },

            {
                headerName: "Status",
                field: "status",
                width: 150
            }
        ]
    }

Source: AngularJS