how to add tooltip in angular for multiple items in an object

1<mat-card>
2   
3    <button mat-raised-button #tooltip="matTooltip"
4            matTooltip="Manually triggered tooltip">
5             Manual Tooltip
6    </button>
7   
8
9    <button mat-button
10            (click)="tooltip.show()">
11      show
12    </button>
13    <button mat-button
14            (click)="tooltip.hide()">
15      hide
16    </button>
17    <button mat-button
18            (click)="tooltip.toggle()">
19      toggle
20    </button>
21
22    </mat-card>
23
24