Ag-grids Full Row Editor pre-populate other cells when selecting a value on first cell?

Question

We are using ag-grid and have enabled full row editing in a table. We have a dropdown on the first column. We want to pre-populate data when they select a value from that dropdown to the other cells. We're finding we're not able to populate the values to the editor.

We think we can populate the data to the table, take the user out of editing mode, refresh the table, then put them back in editing mode. Doesn't sound clean so looking to see if there are any options.

We're using ag-grids existing editor. Any way we can do this? Or is the solution to create a custom editor?

Thanks!