How to group valuis in ag-Grid component

Question

How to group values in ag-Grid component?

I'm working with the ag-Grid component in my project and I'm trying to group some values.

I have defined the columns as follows:

field: "vehiclePlate",
          headerName: lan.plate,
          filter: "agTextColumnFilter",
          filterParams: {
            inRangeInclusive: true,
          },
          rowGroup: true,
          hide: true,

    children: [
      {
        field: "driverName",
        headerName: lan.name,
        filter: "agTextColumnFilter",
        filterParams: {
          inRangeInclusive: true,
        },
        rowGroup: true,
        hide: true,
      },

          field: "kmVelocidadMedia",
          headerName: lan.averageSpeed,
          //valueFormatter: roundDecimals,
          valueFormatter: formatNumberToKmH,
          aggFunc: "max",

The problem is that if I aggregate by a single column, e.g. number plate, the aggregation operations are performed.

Sin embargo si agrupo por dos campos, no hace la agregación, además en el nombre de la cabecera tampoco aparece la operación que realiza

Thanks. Best Regards.

Gruop by many fields