dataList = [
 {
  pname: "abc",
  numbers: [{mobile 1: 123, mobile 2: 234}]
 },
{
  pname: "mno",
  numbers: [{mobile 1: 125, mobile 2: 237}]
 }
]

<tr *ngFor="let data of dataList">
 <td  [attr.rowspan]="data.numbers.lenght">data.pname</td>
 <td>data.numbers</td> // Here how do I show all mobile numbers of the person.
</tr>