TableView merge columns in single row

[Requ]

Hello,

I'm operating on TableView with 4 columns and X row number.

I'm trying to implement mechanism that will merge whole columns in every 5 row or override this row for single one and print text (some kind of group header implementation).

TableView {
    id: table
    ...

    TableViewColumn {
        role: "name"            
        width: 275
    }
    TableViewColumn {
        role: "surname"
        width: 300
    }
    TableViewColumn {
        role: "phone"
        width: 575
    }
    TableViewColumn {
        role: "ip_address"
        width: 525
    }
    model: abonents
}

I was trying to dynamicly change size in itemDelegate to override the cells by set Column 0 on TableView width and rest on 0, but it doesn't worked and looks like this.

Do do you have any idea how to merge or ovveride this row?