Cutom sort function/ data accessor

[enejm]

Hi.

First of all thank you for fantastic library. 🙏

I am having question regarding Data Grid. Is it possible to add custom sort function or set up data accessor like with material table?
I am having nested data. With formatter I can display data, but it does't work for sorting.

columns: MtxGridColumn[] = [
    {
      header: 'Name',
      field: 'user',
      formatter: (data: Report) => `${data.user.firstname + ' ' + data.user.lastname}`,
      sortable: true,
    },
  ];

[nzbin]

<mtx-grid #grid></mtx-grid>

@ViewChild('grid') grid: MtxGridComponent;

// this.grid.table => MatTable
// this.grid.sort => MatSort
// this.grid.dataSource => MatTableDataSource

I haven't used the sortingDataAccessor yet. You can try it and give me some advice.