I want to define as an available aggregation function for a given column the harmonic average using ag-grid. The equation is the following:

where the "weight" is one other column different from the one we want to aggregate and "x" is the column we want to aggregate.

I have made use of the addAggFunc to define a custom aggregation function and printed the params to find out where could the row data be located inside that object, but I could not find it.

this.gridApi.addAggFunc('harmonicAvg', (params) => {
  console.log(params);
  return 0;
});