I have input fields which have Dynamic data I want to do validation for it using custom validation. How to do that?

Question

This is the content for which, I have to do custom validation. In this code, I have to use custom validation. If I used formControlName it not take data dynamically.

<p-organizationChart [value]="data">
      <ng-template let-node pTemplate="custom">
        <div class="node-component">
          <div class="node-header p-corner-top">
            <input [(ngModel)]="node.text.name" required />
          </div>
          <textarea
            [(ngModel)]="node.text.desc"
            placeholder="Enter description..."
            required
          ></textarea>
          <!-- <span
              *ngIf="
                inputValues.controls.desc.dirty || inputValues.controls.desc.valid
              "
              >This is error</span
            > -->
    
          <div class="button-panel">
            <button class="button button-add" (click)="addNode(node)">
              <span class="pi pi-plus"></span>
            </button>
            <!-- <button class="button" (click)="addNode(node)">Add</button> -->
            <button
              class="button button-remove"
              (click)="deleteNode(node)"
              *ngIf="node.parent != undefined"
            >
              <span class="pi pi-trash"></span>
            </button>
          </div>
        </div>
      </ng-template>
    </p-organizationChart>